Portal Login Helper for NJU

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3.3.2
* Support Android 7.1 developer preview;
* Auto retry connection test for poor connections;
* Misc bugfixes.

3.3.1
* Add support for HTC devices;
* Misc bugfixes;
* Remove sensitive information from logcat.

3.3.0
* Add login dialog for conflicting online devices;
* Remove operation code in toasts;
* Fix quick login/logout brings out main activity;
* Various bugfixes.

3.2.2
* Update with latest portal changes;
* Refine balance alert;
* Remove experimental relogin support;
* Bugfixes.