Gradle support with smart validations addition

For such (very common) situations:
![login validations](https://f.cloud.github.com/assets/780153/2479971/8652f574-b0a9-11e3-9c72-057d7eedb513.png)

See, you have to manage validation status of fields independently – but now, you can do it with single validation callback just in one place.

Here is code sample:
https://gist.github.com/almozavr/d13bb2561afff6c5a870