Merge pull request #3 from brianmckenna/testbed

util class to get variable by standard_name
wrapped script in main block to avoid running indexing script when importing other functions from file.
initial commit of script to index comt2 datasets.
changed nc.variables.items -> nc.variables.iteritems to avoid copying lists and added get_global_attribute rapper for easy nc global attribute access.
try/except seemed better
updates.
importing sciwms.util::cf
updated json_all format
changed category to inundation_tropical
changed to pr_inundation
changed to pr_inundation_tropical
fixed json_all nesting.
added reverse lookup from standard name to nc-file name.
gfi use CF standard_name
refactor GFI output