Hlt integrations in the morning of 141106

Integrate in the HLT menu the content of the following jira tickets:
- CMSHLT-156: Dijets for EXO
- CMSHLT-157: Single Photon triggers from SMP
- CMSHLT-158: modification of BPH dimuon paths
- Add CMSHLT-131 (WenHbb trigger paths) to GRun