update badge url
updated .travis.yml
Revert "updated .travis.yml"

This reverts commit c9fe1cb38728dd1cecfc6ecad5c5d45643aca84d.
Add itag 271
added release date
Merge branch 'develop'

Conflicts:
	CHANGELOG
	pafy/pafy.py
	setup.py
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Allow cancellation of active download
Update docstring
use os.path.abspath
Merge remote-tracking branch 'origin/pr/47' into develop
Return temp filename for cancelled download
Merge branch 'develop' into debug
remove thumbnail property test
Updated signature functions
Added changes
Update version number to 0.3.58
Merge branch 'develop'