- Created RunCmd.py for running arbitrary commands that will be recorded in
  the project metadata processing history
- Created ecohydrolib/util.py to contain utility functions
- Fixed typo in documentation for ecohydrolib/wcslib.py
- ecohydrolib/metadata.py: refactor of getCommandLine method
- setup.py: upped version number in prep for release; added new RunCmd.py
- Added ModelRun metadata entity
- Refactored MetadataEntity to be a new-style class
Updated version number for new release