Merge branch 'develop'
Compatible with Python 3
Werkzeug doesn't support Python 3.2
Correct test case names
Clone flask theme for sphinx
Write something in the document
Add github ribbons
Let travis ignore this branch
Import intersphinx
Fix github ribbons
Update document
Merge branch 'docs'
Change _method to _source
Add test case for `_source` argument
Remove the code that fetches argument dictionary
Rename `fetch` method with `from_source`