Merged heppy_7_2_2_patch2 from repository cbernet
introducing fastobjects (decoration), adding jet reclustering code from Giovanni/Claudia, adding METAnalyzer from susyCMG, various cleanup and fixes
minor fixes
rename slow/ to classes/
imlpement cms rule for header guards
adapt MET analyzer to new begin loop
fix in classdef and add ReclusterJets.cc
Merge pull request #3 from arizzi/heppy-VariousImprovements-from-CMSSW_7_2_2patch2

Improvements: lazy autoload, jet reclustering, fastobjects and others