Merge pull request #1253 from mahagr/2.0

Fix #1211 and #1216
Merge pull request #1256 from mahagr/2.0

Better value verification in the backend and fix #1212
Added label for subscription on post creation (#2)
Send proper HTTP errorcodes on error
Send 404 on category and post not found
Default to 404 on errors
Merge pull request #1266 from janich/2.0

#10 - Added label for subscription on post creation (new)
Merge pull request #1268 from mahagr/2.0

Discuss Plug-in: Fix redirect from Joomla article to Kunena topic
Merge pull request #1269 from mahagr/2.0

Fix a small bug in topic reply counting for moderators and admins
Merge pull request #1275 from mahagr/2.0

Fix #1274, #1270, #1262 and Fix incorrect [article] URLs in Joomla 1.5
Sanitize file name to ensure error messages dont display raw file name
of uploads. 
Merge branch '2.0' of ssh://github.com/Kunena/Kunena-2.0 into 2.0
Putting ebay url in message causes error 500
Merge pull request #1282 from xillibit/bugs2

Putting ebay url in message causes error 500
Fix #1281: Missing language string COM_KUNENA_UNPUBLISHED in frontend