Indexing Elasticsearch repository, distinct aggregates, bug fixes

- Indexing Elasticsearch repository
- Remove R dependency from Charts (conflicts in molgenis-palga)
- Bug fix: Fixed Timezone instead of Timezone from server
- New plugin: Indexmanager
- Distinct aggregate algorithm
- Use nested types for all ref data types (categorical, xref, mref)
- Bug fix: Various query generator and sorting bugs
- Update Elasticsearch 1.2.3 to 1.3.2 (performance, distinct aggregate algo improvements)

Requires index rebuild