Merge pull request #2 from flerda/v2.1-dev

Update 2.1 branch from flerda
Merge pull request #4 from flerda/v2.1-dev

Catch up merge from flerda into 2.1
Merge pull request #5 from flerda/v2.1-dev

Catch up merge from flerda into 2.1
Fixed version to match latest released alpha
Bumped version to 2.1alpha2
Merge pull request #8 from flerda/v2.1-dev

Catch up merge from flerda into 2.1
Issue 1401: Text color for white-theme buttons.

Currently the buttons do not have an explicit text color. This works if
the device default theme has a proper color for the text by default, but
fails if the default color is not readable.

This commit makes the color explicit and therefore makes it the same on
all devices.
Don't center-align cards.
Merge pull request #12 from ntsp/Issue635

Issue 635 - Don't center-align cards in global style rule
Merge branch 'v2.1-iss1401' of git://github.com/flerda/Anki-Android into v2.1-dev
Options group management
Merge pull request #11 from ntsp/Add/Remove/Reset-Options

Options group management