Add reverse with some hard coded values to TienboyView


WIP: introductory phase for Diff Doctor Summary of changes: - Created a view for viewing patch results - Created a view for downloading patch files (does not work yet) - Created a PatchError class, which is now caught by ReviewDiffFragmentView


Move location of diff file rejection download

Summary of changes:
- Deleted PatchErrorView, instead rendering content in ReviewsDiffFragmentView
- Simplified get() function in PatchErrorDownloadView
- Add exception handling for SCMErrors (which are in turn thrown when HTTPErrors are thrown, for example a non-responsive endpoint in GitWeb/CGit)
- Added a wrapper in DiffFragmentView to let subclasses insert extra context variables when an error is caught
- Change template code in diff_fragment_error.html to display Diff Doctor information

Add translation. Format fixing and refactor


Rebase diff doctor work onto master branch

Conflicts:
	reviewboard/reviews/urls.py
	reviewboard/reviews/views.py

Display original, diff and reject file in place of error traceback

Summary of changes:
- Changed PatchError to return reject file as an error attribute
- Used Pygments to format the original, diff and reject files (if available), results passed directly to the template (rendered via the safe filter)
- Removed FileNotFoundError (just catch SCMError)
- Changed diff_fragment_error template: removed traceback, and added collapsible links for displaying the files formatted by pygments as mentioned above
- Replaced a few <blocktrans> with <trans>

Merging master into local branch


Merge branch 'master' into test


test to reproduce bug