add print filename of failed task
add test for `as` syntax in excepthandler
fix patchedast to match `as` token in excepthandler
Travis-CI doesn’t support python 2.5 anymore.
Merge pull request #32 from mcepl/enomad

No comments on the list, other than approval from Ali.
Merge pull request #33 from mcepl/travis

Travis-CI doesn’t support python 2.5 anymore.
Add '.tox' to default ignored_resources

Under .tox directory there are many Python files which are not
meant to be edited by hand. Also, having 3.x environments causes
errors when doing refactoring etc.