Horizontal and vertical navigation ok. closes #374 

I have added a new branch with the navigation working stable. Some changes are:

- Removed the ScrollView ( in theory scrollviews doesn't work good together with ListViews). I added a drag-animation effect.
- Optimised a bit and organised code in ReportsFragment and ReportsPaperFragments.
- Changed the moment to load/draw data to the end of navigation movement. In my opinion is better for performance and better for stop the data loading op if the user scrolls fast. 

I have changed many things and I have introduced errors in alignment, clicks, etc. I'll go for them in next PR (#401). 

Fixes #374 
Convention for support library is not to include the whole namespace, instead do it like:

```C#
using Fragment = Android.Support.V4.App.Fragment;
```

This allows us to easily identify where the support library is used and remove dependencies on it very quickly if need be.