Native fragments merged with current master

Hi @emmby @charlesmunger,

here is the native fragments PR #27 rebased on current master : 

* all fragment classes have been documented
* support based fragments classes are in their own package
* maven android plugin has been up upgraded to 3.8.2 and build SDK version is now 17 (could be 19 with some changes)
* better targetting of native fragment (now targeted for honey comb, previously honey comb mr2)
* I cleaned up all warnings from source and tests in eclipse
* gitignore handles eclipse files
* minor correction of injection of fragments with respect to the new injection of view feature.

I tested the new lib on a SDK 14+ app and everything works fine according to me.