Game detail layout fixes.

Button is now pinned to bottom just above Details header.
URBNG-355 & URBNG-356

Created CustomView for layout required by Register and Login fragment.
Provided more meaningful names
[URBNG-341][Android] GPS Task Answer View
Forgot about strings.xml
Merge pull request #57 from herbatnik/android

[URBNG-341][Android] GPS Task Answer View
Merge pull request #56 from KamilLelonek/android

[Android] URBNG-355 & URBNG-356
[URBNG-333][Android] Update database to include comments[changes] for
task
Ready to go. 

[There's additional small patch for task status, which I forgot to write
previously. In past I have added status constant and somehow forgot
about status field. Patch is very small, so I'm sending it together with
this task.]
Merge pull request #62 from herbatnik/android

[URBNG-333][Android] Update database to include comments[changes] for
URBNG-277: [Android] Added GroupViewHolder, changed initLists().