Fix survey code to respect the "multiple_responses" flag. Update changelog, Bump to 1.2.6
Bump to 1.2.7. Fix [#ANDROID-239]
Merge branch 'master' into PushNotifications

Conflicts:
	CHANGELOG.md
	apptentive-android-sdk/src/com/apptentive/android/sdk/util/Constants.java
	docs/APIChanges.md
Merge branch 'master' into PushNotifications

Conflicts:
	CHANGELOG.md
	apptentive-android-sdk/src/com/apptentive/android/sdk/util/Constants.java
	docs/APIChanges.md