Suitable error message when APK download is no APK
Update with same Version Code possible by LastModified Check
CheckUpdateTask changed to use ApplicationContext to avoid memory leak
CheckUpdateTask attach method uses application context
Add LoginManagerListener to handle custom activity flow.
Merge pull request #40 from bitstadium/feature/weakreferencefix

Feature/weakreferencefix
Merge branch 'develop' into feature/redirect

Conflicts:
	src/main/java/net/hockeyapp/android/tasks/DownloadFileTask.java
Merge pull request #41 from bitstadium/feature/redirect

Suitable error message when APK download is no APK
Merge branch 'develop' into feature/sameversioncodeupdate
Remove warnings.

Conflicts:
	src/main/java/net/hockeyapp/android/tasks/CheckUpdateTask.java
	src/main/java/net/hockeyapp/android/utils/VersionHelper.java
Merge pull request #42 from bitstadium/feature/sameversioncodeupdate

Update with same Version Code possible by LastModified Check
Only use timestamp if versionCode is equal.
Adjust last modified time by half an hour.
Fix return value.
Fix handling of version history if the newest build has the same version number.