[#60] Replace records for maps.
[#60] Expect maps instead of proplists from sleep and wakeup.
[#60] Updated tests.
[#60] Updated examples.
[#60, #15] Added tests for basic mongo operations.
[#60] Added elasticsearch to test of basic sumo operations.
[#60] Tests passing.
[#60] Fixed elvis comment.
Merge pull request #99 from inaka/jfacorro.60.change.to.maps

[#60] Change internal records and proplists to maps