Merge pull request #4 from mpuri/master

Make GeoConfig Optional properties null-safe
* Ignoring null-values when persisting composite geo-hash values.
Merge pull request #5 from mpuri/master

Fix division by zero error
* Updating to java 1.7. | * Replacing deprecated static method.
* Upgraded to java 1.7 no need for intellij prop
* Updating to AWS 1.0.13
Merge pull request #6 from mpuri/master

Make the GeoFilters null-safe
Merge pull request #7 from mpuri/master

Update the project version to 1.0.2
* Optimize list creation for geohash ranges