Merge pull request #125 from prusso-sse/master

Quick commit to try/catch JNDI properties instantiation
Fix for JIRA GDP-806.  I also refactored the WCSUtil.generateTIFFFile() method to require a passed in value for the output directory instead of using a possibly missing environment variable.
Merge branch 'master' of https://github.com/USGS-CIDA/geo-data-portal