Tests: added Arabic language fixture
Tests: allow passing options when creating projects
Tests: added disabled tutorial project
Tests: added disabled TP
Tests: check `get_path_obj()` behavior
TranslationProject: added convenience `disabled()` manager method
Removed unnecessary MySQL-style quoting
Take into account TP state when querying cross-language resources

Both Store and Directory queries were not taking into account the state of
projects and translation projects, thus leading to incorrect overview
listings.

Fixes #167.
Tests: allow having stores with the same name
Breadcrumbs: avoid early jumping to the second line
Fix button height now that #navbar overrides line height globally
XHR API: allow arbitrary number of args
Add reviewed_by and reviewed_on fields to Unit
Add ScoreLog

Every translation action (based on a Submission) has to be
saved as ScoreLog (part of #152)
Add score field to PootleProfile

part of #152
Log ScoreLog changes to pootle-activity.log

part of #152
Allow to use Unit.submitted_by as a previous translator

When creating submissions (and therefore ScoreLog entries), we need to
access the unit's state before it's saved, therefore we first create
the relevant submissions and then save the unit, adjusting the submitter
information when necessary.