Added support for locality group caching, entry deletion, and alternative indexing by data/adapter ID

Performance enhancements for row deletion

Removed dead code
Merge pull request #52 from ngageoint/GEOWAVE-47

Added support for locality group caching, entry deletion, and alternativ...
Updated screenshots in readme
GEOWAVE-55 created tavis build matrix
GEOWAVE-55 created tavis build matrix
Merge branch 'travis-build-matrix' of github.com:ngageoint/geowave into travis-build-matrix
GeoLife plugin, fixed type in Tdrive plugin