Merge pull request #1 from PecanProject/master

Update my branch of pecan with vm workflow.r fix
outline of met2CF function based on Ameriflux as Met to convert
Merge branch 'master' of https://github.com/jam2767/pecan
updates to connect to bety
updates to met2CF.Ameriflux and creation of met2CF.csv. met2CF.csv contains combination of old code with workflow outline and beginning of conversions of .csv to netCDF. Both still contain example files.
Merge branch 'master' of https://github.com/jam2767/pecan
created test.met2CF.Ameriflux and added Roxygen tags, tests and ability to copy old .nc file to a new file in met2CF.Ameriflux
changed temperature and pressure units. function works for multiple USMOz years
Moved some of Mike's old met utility functions from flux2lsm to metutils:  SatVapPres, RH to SH, Exner function, air density
added conversion for U and V, precip, and RH to SH. Unresolved error in code that is supposed to write new netCDF variables to an existing file.
wrote specific humidity to new variable in netCDF file
fixed precip conversion to be for seconds, not minutes
u and v conversion, with creation of new variables. One fix remaining before operational. u and v vectors are incorrect length
successfully tested on files from multiple sites (MOz, Dk2, Ho1, Ha1)
test for files form multiple sites
added met2CF.Ameriflux to description, added met2CF.Ameriflux and rh2rv to namespace, moved met2CF.Ameriflux.R from /inst to /R, moved test.met2CF.Ameriflux.R to /tests

changed variable names for u and v
Merge branch 'master' of github.com:PecanProject/pecan
Merge pull request #107 from jam2767/master

added met2CF.ameriflux function