Add coverage report
Omit library modules from coverage
Only measure coverage of code in the PIL directory, but includes all those files, even those unexecuted
Include PIL/*.py for coverage to see if it includes unexecuted code
Re-enable notifications
Add pep8 and pyflakes reports to Travis CI
Fix variable name

Wrong variable name was used for transparency manipulations.
Merge pull request #594 from hugovk/master

Add coverage reports for Python code on Travis CI
Merge pull request #604 from nijel/patch-1

Fix variable name
Add history