Modified FormHelper interface to isolate android-support-v4 library dependency.
Moved FormHelpers to helper package.
Added default constructors to fragments.
Added docker test script to execute connectedCheck with jdk6.
Removed obsolete comment.
Modified ValidationManager to initialize lazily.

To increase the coverage of the project, avoiding ValidationManager creation is required for now.
Loading ValidationManager will now happen when FormHelper#validate() or some other methods are called, not on FormHelper class is created.
Renamed FormHelper subclasses.
Updated READMEs.
Backwards-incompatible changes: Merge branch 'isolate-support-v4-dependency'

* To limit android-support-v4 library dependency, FormHelpers are split.
* Refined package structure.
Added tests for XxxFormHelpers.