WIP/ENH: adding non-airport Wunderground data sources
ENH: non-airport wunderdata working, but some tests are failing
BUG: have to force pandas 0.12 to parse the date columns
ENH: added function to dump precip data to SWMM format (and refactored resampling to a seperate function also used by _plotter)
BUG: catching exceptions with RAWS stations are not in the info file
TST: added dumpToSWMM to the example and cleaned it up
Merge pull request #34 from phobson/add-nonairport-wunder-data

ENH: Data from RAWS stations on Wunderground and a dumpToSWMM function for rainfall data