GAAS-v1.1.0

• update knowledge (e.g. gff_to_gtf.md gff_to_bed.md)
• add Utilities in lib
• change prefix of all script in their original location (now contains gaas_)
• add a new script to clean/purify fasta sequence: fasta_purify.pl
• modify fasta_statistics.pl to just report info. It does not clean the sequence anymore (done by fasta_purify.pl)
• output of fasta_purify.pl and fasta_statistics.pl has now input name as prefix.