Testscenario:

Setup Hook with github.

Push branch change to github => build will be triggered (OK!)
inside the build, create a tag of that build and push it to github => another build will be triggered (FAIL!)

Output of github-hook-log:

```
Started on 29.12.2013 13:28:36
Polling SCM changes on master
Using strategy: Default
[poll] Last Built Revision: Revision 20b251f792fe8d0f180395c3457db5be3a75b077 (origin/master)
Done. Took 2,9 Sekunden
Changes found
```

it seems that it "always" finds changes, even if the sha of the revision is always the same???

It also triggers builds if you change a different branch than specified in "branches to build"-list