Bump Thread for myBB 1.4

[Zenk]

Both work on 1.6.4 and 1.6.5 -- thank you
Zinga Burga, thanks, I'm trying not to overload my forums with 1million plugins, but I find this plugin very useful.

The only thing that is missing is - there is no information when has the thread been last bumped. Hard to keep track for moderators, if the thread has been bumped before its time. (Different forums got different allowed bump times, some have 24h and some 72h etc.)