PatchSet master-detail flow

PatchSetViewerFragement maintains the changeID itself.
Fix passing the changeID to the fragement
Included the fragement as a seperate layout file.

Change-Id: I97af38b29138400bfa42f0c06c64ba841d97816a
Tablet fixes

Split tablet layout in half (half screen for each fragment)
PatchSetViewerFragment: Disable caching. Similarly to GerritControllerActivity, this caching mechanism is flawed
Save and restore selected change (for tablet layouts)
Use card onClick listener instead of a small icon on tablets.

Change-Id: Ied30feee857dfe7a9f8927228f830f19a8496b98