OSX: strip does not work when forming a bundle.  Fixed.

The underlying problem was that the BUNDLE class did not draw files
from the appropriate cache; it always uses the "00" cache.  Now,
BUNDLE obeys the strip/upx flags that the input COLL or EXE object
has, which in turn depends on the command line options passed to
pyinstaller.
Changed initializations of upx and strip variables to True/False
as appropriate.  Also keyworded the arguments to checkCache for
better explicitness.
Merge pull request #55 from dhyams/fix_bundle_strip_bug

OSX: strip does not work when forming a bundle.  Fixed.