[Fix bug 1090402] Resolve actions items after voting for a budget poll.

* Use constants instead of strings for action item names
Merge pull request #841 from johngian/fix-resolve-polls

[Fix bug 1090402] Resolve actions items after voting for a budget poll.
[bug 1087280] Add feed categories help text.
Merge pull request #842 from glogiotatidis/1087280

 [bug 1087280] Add feed categories help text.
[fix bug 1091468] Resolve action item if there is no assignee.
Merge pull request #843 from akatsoulas/1091468

[fix bug 1091468] Resolve action item if there is no assignee.