Exotica dqm update and migration thread safe

This branch is a continuation of this one: https://github.com/cms-sw/cmssw/pull/5787#issuecomment-59010324. (Sorry for opening a new thread for this PR).

The update wrt the last PR are:
-Migration of the EDAnalyzer to DQMEDAnalyzer as sugested by deguio and Dan in the Twiki. Is possible to test it?? I have tested the code with whiterabbit.py and all the test seem OK, but I dont know if this is enough.

- Unfortunatly I did not migrate the DQMEDHarvester, but I am not sure if I have to do this for the DQM/Physics/src/ExoticaDQM.h and .cc .  

-Then, a considerable reduction of the total number of histograms. Before I had histograms for all the Exotica High Priority Analysis: dijet dilepton and diphoton repated twice for the leading and subleading object and now they are merged into one.

-Information about triggers is also added. This will be fully implemented once the triggers are more defined, but in the current version I only require triggered events.