rerddap v0.3.0

NEW FEATURES

• Cache functions accept the outputs of griddap() and tabledap()
  so that the user can easily see cache details or delete the file from
  the cache without having to manually get the file name. (#30)

MINOR IMPROVEMENTS

• All package dependencies now use importFrom so we only import
  functions we need instead of their global namespaces.

BUG FIXES

• Fixed bug in parsing data from netcdf files, affected the
  griddap() function (#28)