retrieves gerp RS scores using multiprocessing.
get_rs_scores_from_gerp chr list should start from chr1 not chr0.

Fixed minor white spaces in check_motif_cooperativit.py
Added genename colname as option flag. I left event and event_name
strings as they are, to prevent breaking of older pipelines.
Removed optparse.Options import. Unused.
updated motif info dic saved to pickle.
wrap long lines
Added null_mode option flag.
intron 5p was actually incorrect. Fixed. Also did a fix where it checks
seq end > seq start
edited comment for when multithreading should happen