Enhancement to apply filter in test discovery

[jpellerin]

Attached is a diff to the cover.py plugin that adds a new configuration
option. This option allows the coverage report to filter out files that
match a specified prefix.

I've found this quite useful when testing in a large project with many
subpackages. The filter option allows me to evaluate the coverage of a
package without including coverage information for the other packages it
depends on!

I've tried this with nose 0.10.1.

Google Code Info:
Issue #: 207
Author: whart222
Created On: 2008-09-26T18:27:21.000Z
Closed On: