Pick cleanup: Don't display messages with word counts

This gets rid of the messages shown below the roleup and above the
translate actions. That data is meant to be shown in the roleup.
Pick cleanup: Don't display the legacy summary in the roleup

These changes are meant to get us closer to Evernote, and reduce conflicts.
Refactor retrieving the common overview context

Pick notes: Had to do heavy adjustments since we serve part of the data using
    JavaScript, and our overview view is very different than Evernote's.

Conflicts:
	pootle/apps/pootle_translationproject/views.py
	pootle/core/helpers.py
Dirty fix to get the TP overview working

The following exception was being thrown: 'TranslationProject' object has
no attribute 'is_dir'.

Not sure why the `request.ctx_obj` (I even tried `request.resource_obj`) in
`get_overview_context` is not working, because it should.
Partial pick: We won't always have a resource path

Pick notes: This is picking the rest of the commit that we didn't have.
Cleanup: removed dead code
Add ability to disable projects (#97)

Conflicts:
	pootle/apps/pootle_project/models.py
	pootle/core/decorators.py
TranslationProject: added convenience `disabled()` manager method
translationproject: Add the ability to disable a translation project

Cherry-Picked-From: a6b5dd9db6e6495444730d4e33b354315e86e967
Disabled translation projects aren't to be updated

No log error messages while update_stores after whole directory
of translation project was removed

Cherry-Picked-From: 1ad4f599abe8c870c3793bc7facd95fed031aeb4
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
Tests: allow having stores with the same name