Minor fixes to issues found during testing.

- Close logger and resume printing to stdout and stderr
- Improved parsing of config file (specifically individual float and int values)
- Fix to invalid char function during reading of station names.  Now only allow alpha numeric characters and a selection of underscore and period type chars.
Fixes to issues found during testing.
- Add missing variables when not subsetting unit hydrographs
- Add function for handling disallowed characters (see previous commit)
- Remove compression args for character arrays (outlet_names)
- Replace source area variable in sample configuration file.
rename scrip rvic_model to rvic, associated changes to setup.py and README