Put the WRF version of ESMF time-manager in for CAM/CLM

Ideal engineering time: 2 weeks
Actual time: Oct 3rd - Nov 8th (5 weeks)
Load factor: 2.5
About 9000 lines of code
360lpd

• Add the relevent module, add to CVS modules for cam1, clm2, ccsm3
• Add the WRF version of ESMF time-manager to CAM
• Update time-manager to latest interface (using the ESMF-FV branch as example) so can work with ESMF_wrf for both CAM and CLM.
• Unit test time_manager so ensure answers are correct for long simulations.
• Make sure will build and run properly everywhere.