added a gc_content method method to the GenericPositionMatrix in Bio.motifs (contributed by Anthony Mathelier of UBC)
removed some whitespace
Avoid NaN results if p is zero
Two blank lines between classes (PEP8)
Fix lots of overly long lines, try to follow PEP8 for property docstrings
Omit argument with default value
Adding static argument to Bio.Application, use for BWA