Model CF-metadata and naming conventions standardization

[EarthScientist]

known issues needing to be overcome:

• [x] PANDAS DateTime api is limited to dates < 2200... this is a real pain since there are files which span 2006-2300. These files are not currently supported and a workaround for dealing with them is necessary.
• [x] CCSM4 model data has a different naming convention than the other files. This is the only set of data that uses that convention and therefore is being problematic since we need to harvest meta information from the filenames in order to know what to do with the files without opening them. This is in need of a solution.
• [x] Historical data needs to be properly handled in the file naming convention being output as I am currently outputting them with the wrong begin / end time suffixes. This is a fairly easy fix but is in need of completion

[EarthScientist]

There is still an outstanding error now being thrown from the GFDL-CM3 model. The other outstanding errors are now solved.

• [x] repair error that has creeped in with the GFDL-CM3 model data. Investigation will be required as this is an odd error