Database cleanup endpoint for acceptance tests

Signed off by: Daniel Paulino Alves <danpaulalves@gmail.com>
Nested reading requests into reading group

Signed off by: Daniel Bucher <daniel.bucher88@gmail.com>
Signed off by: Diego Araújo <diegoamc90@gmail.com>
Creates tmp on Travis environment
Merge pull request #8 from mezuro/nested_readings

Nested reading requests into reading group
Merge pull request #7 from mezuro/test_helpers

Database cleanup endpoint for acceptance tests
Initial implementation of Range, waiting for Metric Configuration
Updated database.

Signed off by: Rafael Manzo <rr.manzo@gmail.com>
Renamed mezuro_range to kalibro_range. Fixed the routes.

Signed off by: Rafael Manzo <rr.manzo@gmail.com>
Unit tests for kalibro_ranges

Signed off by: Daniel Bucher <daniel.bucher88@gmail.com>
Finished KalibroRanges and moved ranges_of action to MetricConfiguration

Signed off by: Daniel Bucher <daniel.bucher88@gmail.com>
Removed method ranges_of from KalibroRange

Also removed HTTP method from desribes on MetricConfigurationController
spec as other controller specs aren't using this as a pattern.