[maven-release-plugin] prepare release 3.0.1
[maven-release-plugin] prepare for next development iteration
Fix java.lang.NoSuchMethodError

https://developer.android.com/reference/java/lang/String.html#isEmpty() is available only for Api 11 and not Api 9. 

Better use https://developer.android.com/reference/android/text/TextUtils.html#isEmpty(java.lang.CharSequence)
Merge pull request #19 from bunjix/patch-1

Fix java.lang.NoSuchMethodError
Ignored IDEA metainformation files and update dialog has been made optional.
Modified onUpdateListener in order to be able to reach updates information outside HockeySDK.
Fixed javadoc for missing parameters.
Extracted intent extra strings to avoid magic values and fixed wrong javadoc.
Merge pull request #20 from tuenti/optionalDialog

Optional dialog when updates are discovered.
First approach adding Gradle as a build system. Seems to be working fine but further tests are needed.
Generated gradlew.
Merge pull request #21 from fjfdeztoro/gradle

Gradle support
Split CheckUpdateTask into CheckUpdateTask and CheckUpdateTaskWithUI. Later one is dealing with fragments and activities, while the first one works with any context.
Removed unused parameter in method registerForBackground
Updated Android Annotations dependency version to work with the last one provide by maven-android-deployer.
Merge pull request #22 from tuenti/update-from-context

Update from a non activity Context
Fix NPE (issue #23).
Fix NPE when posting feedback with no connection.
Set both versionCode and versionName in crash logs.
LocaleManager added for localization of HockeyApp SDK strings.