[#74] Removed examples from source folders. Added elasticsearch backend and repo.
[#74] Elasticsearch backend and repo working... sort of.
[#74] Elasticsearch find_by working. Delete_by and create_schema missing.
[#74] Use tirerl instead of erlastic_search.
[#74] Assign generated id if none is provided. Improve query generation.
[#74] Mapping creation.
[#74] Index creation before mapping creation.
[#74] Removed io:format/2.
[#74] ElasticSearch blog example.
[#74] Fixed elastic-blog example.
[#74] Added count to delete functions.
[#74] Removed master version for tirerl.
[#74] Fixed elvis comments.
[#74] Merge with master.
[#74] Add min OTP version. Fix comments.
Merge pull request #75 from inaka/jfacorro.74.elastic_search.backend

[Closes #74] ElasticSearch backend and repo