Update README.md
Merge pull request #57 from andrewtat/master

Update README.md
Resolve merge conflict for README.md
Resolve merge conflict for README.md
Fix typo in README.
[#ANDROID-178] ConcurrentModificationException in survey code.
Refactor database accessor method to remove it from Apptentive.java, and turn it into a singleton so it doesn't get recreated on each access. Since I was synchronizing on the instance, this was probably the source of some database locking problems.
Use finally/close pattern for closing cursors and db connections in database code. Fix dev test activity to actually delete messages when the Delete All Messages button is pressed. Remove some warnings.
Merge branch 'master' into next

Conflicts:
	CHANGELOG.md
Merge branch 'master' into next

Conflicts:
	CHANGELOG.md