Update README.md
Update README.md

How to use "Geo-entities" (indexing, queries)
DATAES-34 #17 - added option to inject custom implementation of ResultMapper
Merge pull request #28 from fmarchand/master

Documentation (README.md) for Geo Location / Filter Feature
DATAES-34 #17 - documentation for custom result mapper
DATAES-38 : Add/Remove/Get Alias Support
 DATAES-39 : SearchResultMapper support for scroll and queryForPage
 DATAES-31 : Add the ability to index arbitrary JSON strings
 DATAES-31 : build failure