Merge branch 'release/0.3' into develop
Add status checkers for each status code that Werkzeug supports
Merge pull request #3 from schworer/werkzeug-status-checkers

Add status checkers for each status code that Werkzeug supports
Added explicit werkzeug dependency

Since we're now importing directly from werkzeug, it's now listed as a
dependency.  Doesn't matter much since flask depends on it, but seems
better to be explicit.
Updated README.md for be_xxx updates
Version numbers & changelog updates for v0.4
Merge branch 'release/0.4'