rm nwis.pytables and replace nwis.pytables calls with deprecated references to nwis.hdf5
rm nwis.pytables tests
make a dependency-error'd version of nwis.hdf5
add changelog notes about nwis.pytables -> nwis.hdf5
set func name for dependency errors so that using nwis.pytables w/out pytables
installed doesn't give a confusing error
change default usgs h5 file path to ulmo_usgs.h5
remap site_properties when parsing site info from hdf5.get_site_data()
filter out pytables.NaturalNameWarning and pandas.io.pytables.PerformanceWarning
format startDT and endDT as iso dates for the daily value service
make sure empty updates (responses with no values) work fine