FIX Back port of bug fixes and enhancements from silverstripe.org/forum
Merge pull request #80 from camfindlay/backports-ssorg

FIX Back port of bug fixes and enhancements from silverstripe.org/forum
ENHANCEMENT fixed hardcoded subscription links and bugs for sub/unsub actions.
Merge pull request #75 from camfindlay/subscribefixes

ENHANCEMENT fixed hardcoded subscription links and bugs for sub/unsub