Test of string encryption/decryption

The test was created for all 4 platforms: windows, iOS, android, mac.
The screenshots of tests are here:
1) Android
![android-test-01](https://cloud.githubusercontent.com/assets/8819146/4617799/157eb69c-5303-11e4-9daf-a2ffe507a83f.png)

2) iOS
![ios-test-02](https://cloud.githubusercontent.com/assets/8819146/4617779/ed2da9dc-5302-11e4-8692-77258732df81.png)

3) Windows
![win-test-02](https://cloud.githubusercontent.com/assets/8819146/4617785/f59f4ed6-5302-11e4-9a99-3a7f11a01cc6.png)

4) Mac
![mac-tests-all](https://cloud.githubusercontent.com/assets/8819146/4617793/fd6f93be-5302-11e4-8874-dcf69572436d.png)