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.
Merge pull request #34 from mcepl/tkf-default_config

Add '.tox' to default ignored_resources