Merge branch 'unstable' into DA-426

* unstable:
  fix the RestStore.PrintResponse(string) method and use it only in DEBUG
make filters single-selection (not working yet)
<DA-426> Merge branch 'unstable' into DA-426

* unstable:
  <DA-406> remove unused code[2]
  <DA-406> remove unused code
  small fix
  <DA-406> use hash tags
<DA-426> single filter in FilterController
<DA-426> Merge branch 'unstable' into DA-426

* unstable:
  excluded content-pri
<DA-426> update iOS UI
<unstable> Merge branch 'DA-426' into unstable

* DA-426:
  <DA-426> update iOS UI
  <DA-426> single filter in FilterController
  make filters single-selection (not working yet)