Merge pull request #6 from tkunicki-usgs/master

updates
Merge pull request #7 from tkunicki-usgs/master

NetCDF file cache implemented
Merge pull request #8 from tkunicki-usgs/master

Hardened shapefile joining dbase datastores
Merge pull request #9 from tkunicki-usgs/master

datastore fixes and more!
Merge pull request #10 from tkunicki-usgs/master

updated demo
Merge pull request #11 from tkunicki-usgs/master

Bug fixes
Merge pull request #12 from tkunicki-usgs/master

Updated demos
updated parent pom to include demo projects