Issue #4 and Additional Functionality

Added static method on Features to convert Feature Classes to a
collection of feature objects.  Improved JSON to Feature Class process
to address issue #4.  Modified create_local_copy to use new JSON process
to get into feature class.  Added additional common methods to help
creating temp files on disk.  Now writes JSON and temp feature classes
to disk in scratch workspace (arcpy's scratch).  The scripts is
successful should clean up the temp files.