0.0.9
 - Resolve dependency hell

0.0.8
 - Using Elastic bulk API
 - Optimisations of index mappings
 - Performance optimization

0.0.7
 - Refactoring

0.0.6
 - Support elasticsearch-model gem version 0.1.8

0.0.5
 - Search by file name on master branch
 - Migrate from elasticsearch 0.9.x -> 1.x

0.0.4
 - Stable version