Improved layout hierarchy

I have removed 2 levels of view hierarchy for each FlipCheckBox, you were inflating a LinearLayout with only one item inside another LinearLayout that only contained that inflated one, so I changed all this just merging an inflated xml with an extension of ViewFlipper.

Hierarchy before:

![screenshot 2014-08-22 15 02 12](https://cloud.githubusercontent.com/assets/587050/4010916/2ccd0a3a-29fd-11e4-89d1-8f2ea353921d.png)

Hierarchy after:

![screenshot 2014-08-22 15 00 12](https://cloud.githubusercontent.com/assets/587050/4010912/22dc7858-29fd-11e4-8581-604148e5ced6.png)