Reorganized the example folder and added files for the doc example

example/data/download_female_samples.sh

+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519804/SRR1519804.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519805/SRR1519805.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519806/SRR1519806.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519807/SRR1519807.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519808/SRR1519808.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519809/SRR1519809.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519810/SRR1519810.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519811/SRR1519811.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519812/SRR1519812.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519813/SRR1519813.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519814/SRR1519814.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519815/SRR1519815.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519816/SRR1519816.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519817/SRR1519817.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519818/SRR1519818.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519819/SRR1519819.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519820/SRR1519820.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519821/SRR1519821.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519822/SRR1519822.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519823/SRR1519823.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519824/SRR1519824.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519825/SRR1519825.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519826/SRR1519826.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519827/SRR1519827.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519828/SRR1519828.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519829/SRR1519829.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519830/SRR1519830.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519831/SRR1519831.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519832/SRR1519832.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519833/SRR1519833.fastq.gz

example/data/download_male_samples.sh

+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519834/SRR1519834.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519835/SRR1519835.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519836/SRR1519836.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519837/SRR1519837.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519838/SRR1519838.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519839/SRR1519839.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519840/SRR1519840.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519841/SRR1519841.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519842/SRR1519842.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519843/SRR1519843.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519844/SRR1519844.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519845/SRR1519845.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519846/SRR1519846.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519847/SRR1519847.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519848/SRR1519848.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519849/SRR1519849.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519850/SRR1519850.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519851/SRR1519851.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519852/SRR1519852.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519853/SRR1519853.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519854/SRR1519854.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/005/SRR1519855/SRR1519855.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/006/SRR1519856/SRR1519856.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/007/SRR1519857/SRR1519857.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/008/SRR1519858/SRR1519858.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/009/SRR1519859/SRR1519859.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/000/SRR1519860/SRR1519860.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/001/SRR1519861/SRR1519861.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/002/SRR1519862/SRR1519862.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/003/SRR1519863/SRR1519863.fastq.gz
+wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR151/004/SRR1519864/SRR1519864.fastq.gz

example/data/popmap.tsv

+SRR1519834	M
+SRR1519835	M
+SRR1519836	M
+SRR1519837	M
+SRR1519838	M
+SRR1519839	M
+SRR1519840	M
+SRR1519841	M
+SRR1519842	M
+SRR1519843	M
+SRR1519844	M
+SRR1519845	M
+SRR1519846	M
+SRR1519847	M
+SRR1519848	M
+SRR1519849	M
+SRR1519850	M
+SRR1519851	M
+SRR1519852	M
+SRR1519853	M
+SRR1519854	M
+SRR1519855	M
+SRR1519856	M
+SRR1519857	M
+SRR1519858	M
+SRR1519859	M
+SRR1519860	M
+SRR1519861	M
+SRR1519862	M
+SRR1519863	M
+SRR1519864	M
+SRR1519804	F
+SRR1519805	F
+SRR1519806	F
+SRR1519807	F
+SRR1519808	F
+SRR1519809	F
+SRR1519810	F
+SRR1519811	F
+SRR1519812	F
+SRR1519813	F
+SRR1519814	F
+SRR1519815	F
+SRR1519816	F
+SRR1519817	F
+SRR1519818	F
+SRR1519819	F
+SRR1519820	F
+SRR1519821	F
+SRR1519822	F
+SRR1519823	F
+SRR1519824	F
+SRR1519825	F
+SRR1519826	F
+SRR1519827	F
+SRR1519828	F
+SRR1519829	F
+SRR1519830	F
+SRR1519831	F
+SRR1519832	F
+SRR1519833	F