add missing standard library includes
Merge branch 'SDepenbrock-master' to include pull request #62
Merge branch 'master' of github.com:jgukelberger/ITensor

Fixed Conflicts:
	itensor/global.h
	utilities/cppversion.h
Merge pull request #63 from SDepenbrock/master

Added check for diagonal tensors to Spectrum
Merge pull request #64 from SDepenbrock/ITensor into master
Tested and made some minor improvements to MPS write to disk code.
Updated older Model class name with SiteSet for tutorial/04_mps
Renamed 05_DMRG tutorial folder to 06_DMRG to make room for new time evolution tutorial.
Removed an out of date comment
Made itensor namespace usage more correct for tutorial/04_mps
Fixed ShowPercent feature of TEvolObserver.h
Added new tutorial 05_gates
Removed const from tensor in 05_gates tutorial. Added a hint to the instructions.
Fixed up diffs to newest version