Merge pull request #191 from nicolas-raoul/v2.1-dev

Replaced String.isEmpty with TextUtils.isEmpty because does not exist on...
Avoid answer sound chaining after editor exit
Merge branch 'AvoidMultipleAudioListAddition' of git://github.com/chajadan/Anki-Android into v2.1-dev
Bumped version to 2.1beta5
Fix crash due to unaccessible replayq
Merge pull request #193 from chajadan/EnsureReplayQPreferenceIsAccessed

Fix crash due to unaccessible replayq
Bumped version to 2.1beta6
cp instead of mv so that ant installr still works
Possible fix for issue 2005
Merge branch 'v2.1-dev' of github.com:ankidroid/Anki-Android into v2.1-dev