removed redundant functions in file nceputils.R
renamed cruncep_nc2dt to load.cfmet
moved to load.cfmet to temporal.downscaling.R
moved data.table back to depends so that
moved cfmet.temporal.downscale to temporal-downscaling file
minor changes to accomodate issue with data.table indexing not working as expected http://stackoverflow.com/q/24501245/513006
added and revised documentation
added test file for daily downscaling
added tests for load.cfmet function
converted weachDT to new cfmet.downscale.daily function
added cfmet.downscale.subdaily function
added lightME to calculate light Macro Enviornment (from BioCro)
updated tests / added tests and test input for subdaily downscaling
Merge pull request #165 from PecanProject/met-downscaling

Adding / updating met downscaling functions