replace importlib with __import__
fix recognition of basic types in templates in script which generates the Serialization.cc files
Merge pull request #5524 from ktf/fix-clang-3.5-issue

Support for clang 3.5
Merge pull request #5513 from davidlange6/remove_importlib4

replace import lib with python 2.6 compatible command
Merge remote branch 'origin/CMSSW_7_2_X' into CMSSW_7_0_X