Fix #26: Figure out wheel file version.

The wheel file spec [0] defines the filename pattern
for wheel archives. This uses that to check package name
and get the version.

Also fix the exception to report the file and package name
on failure.

[0] http://legacy.python.org/dev/peps/pep-0427/#file-name-convention
minor style crap; no behavior changes
Add wheel support to version history. Bump version to 1.0.
Merge wheel support. Close #27.