make gen_range use numpy so i can understand it. add defaults to optparse help.
make gen_range use numpy so i can understand it.
add defaults to optparse help.

shashidhar22/bio-playground,brentp/bio-playground,shashidhar22/bio-playground,brentp/bio-playground,shashidhar22/bio-playground,shashidhar22/bio-playground,brentp/bio-playground,brentp/bio-playground,brentp/bio-playground,brentp/bio-playground,shashidhar22/bio-playground,shashidhar22/bio-playground