converts number of hits to a fraction now.
prints eventtype in error msg if not recognized as a known splicing
event.
change fileout put from exon1 to exon_1, intron1 to intron_2
distance from exon is no longer 300 bp constant, can be variable.
Script now runs by specifying directory to bedfile, it auto names all
the bed files. 
Appended bedfile is no longer a path, but a filename to be specified.
appended bedfiles now has a default name if you do not specify anything.
input and output dir are no longer option flags, but are positional
arguments.

Added usage for those who want a help msg.
inclusion and exclusion list requires only bed file directory to be
specified. Assumes exon_1, exon_2, etc are already in the directory.
now just specify bed input dir, bed output dir, and your misobf file.
simpler.
Appended bed files is now truly option. Also changed a5p to 5p etc.
append names with underscore rather than a period. It fits with the meme
suite pipeline better.
changed varaible to variable.
commit: added then removed a maxsize option flag.