Changes to import_alignment.py and fabfile.py

Import_alignment.py -- Minor refactoring to make it a bit more user-friendly. Now you can just edit in one place to switch languages, not several.
Fabfile.py -- Alterations to account for the fact that Ubuntu comes with some strange Postgres issue. Also added code into setup_frontend task to pull in git submodules.
Updated installation instructions.
Updates to fabfile.py
Merge branch 'master' of github.com:OpenPhilology/phaidra
Experimenting on the look of the lessons screen.
Removed unused CSS.
Code clean-up, reader bug-fixes, compiled RTL CSS.
Refactored CSS, added LTR/RTL Sass compilation task to Gruntfile.
Removed unused CSS files.
Filtering on API endpoints, bugfix for lesson screen.
Updated App categories. Run "fab import_db" to pull in the updates.
Updated App categories. Run "fab import_db" to pull in the updates.
Grammar API endpoint includes titles in other languages.
Lesson screen and textbook content localization support.
Merge pull request #48 from OpenPhilology/lessons-screen

Lesson content localization.
More frontend integration with admin options for content creators.

Superusers will see the lessons screen along with lessons that still need content appended to them. It then links them to the content creation screen with the corresponding topic filled out.
Shifted admin-related UI components to template responsibility.
Some basic notification/error handling.
Lots of localization updates (esp. to support Farsi):

- New UI components CSS marked up for flipping.
- Fixed visual bugs related to RTL display.
- Marked strings for translation in both js and template files.
- Lesson tasks now pull data from set language of user.
- Changes to database, to demonstrate how content should be added to grammar topics in the UI.
- Ran commands to collect localization files for FA, DE, IT, HR.
Merge pull request #49 from OpenPhilology/development

Admin and Localization features.