Merge pull request #1694 from bcipolli/securesync-subtree

Moving securesync into its own repo, adding to ka lite as a subtree
Merge pull request #1703 from bcipolli/1644

Separate settings.py by app
Fixed duplicate results in search.
Fixed.
 Issue 1476 Don't show Dropdown box if only one language is there
Merge pull request #1710 from anuragkanungo/issue1476-local

 Issue 1476 Don't show Dropdown box if only one language is there
Merge branch 'develop' of github.com:learningequality/ka-lite into 292

Conflicts:
	kalite/testing/__init__.py
Merge pull request #1664 from bcipolli/292

Fix for #292: Allow selecting non-math topics with exercises for viewing coaching data.
Merge branch 'develop' of github.com:learningequality/ka-lite into 1677

Conflicts:
	kalite/testing/__init__.py
Merge pull request #1687 from bcipolli/1677

Show topics with exercises as available
Fix for #1677: show topics with exercises as available.
Add tests for validating topic and video availability.
 Issue 1476 Don't show Dropdown box if only one language is there
updated .gitignore
Added a pop-up window to confirm before deleting the videos
Typo Corrected
made User Interface and Internationalization changes
removed cross sign from title bar
remove empty blocks
reset property by assigning null