Merge pull request #72 from sagemath/beta

Merge beta into master
Initial Documentation

-Misc renaming and pruning.
-(Partial) update of about.
Update links in about
Update docs
Fix tablet layouts

-Add a vertical separator.
-Define new layouts for tablets.
-Set selection mode for API 11 and above.
-Add hints to SearchViews.
Revert some code.
Bugfixes & Improvements

- Fix crash on rotations
- Select the first group as default.
Prevent save when playground
Misc grammatical corrections.
Suppress lint checks for Subsribe methods

-Add some misc comments and docs.
Duplicate menu res for higher dpi tablets
Bump version, update changelog
Initial Documentation

-Misc renaming and pruning.
-(Partial) update of about.
Update links in about
Update docs
Fix tablet layouts

-Add a vertical separator.
-Define new layouts for tablets.
-Set selection mode for API 11 and above.
-Add hints to SearchViews.
Revert some code.
Bugfixes & Improvements

- Fix crash on rotations
- Select the first group as default.
Prevent save when playground
Misc grammatical corrections.