[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