Merge pull request #168 from bcow/master

Finished met workflow for NARR and beginning work on generalizing
updated data.atmosphere documentation
merge

Merge branch 'master' of github.com:PecanProject/pecan

Conflicts:
	modules/data.atmosphere/DESCRIPTION
minor fix to read.settings to use `which.max` directly on date object since `ymd_hms` is not vectorized refs gh-169
Updating met2CF functions and added a generalized met.workflow