[maven-release-plugin] copy for tag v3.1.3

Fix bug: registrationId method - typed with ALIAS

Fix bug - null extras will cause IllgalArgumentException, android notification.anroid() will enter into this situation
Distinguish 'read timed out', and add a state for APIConnectionExcepiton
Add tests for connect timed out and read timed out

Release v3.1.1:

1. Add payload length checking methods - global, and ios notificaiton
2. Add platform shortcuts for Notification.

Release v3.1.0:

1. Throw exceptions if error - network error, or response error;
2. If connect timed out will retry 3 times by default;
3. Fix tests name convention bug;
4. Client default value:   apns_production will always be set.  set with False by default.
5. Client default value:   ios sound will be set  be default;  badge will be set with 1 by default.

[maven-release-plugin] copy for tag v3.0.1

[maven-release-plugin] copy for tag v3.0.0

Fix bug: lack of content-available param for ios

Bug fix: no winphone platform for default all platform selection.

Support WinPhone push (toast only yet)

Release v2.3.0 - a refactoring version.