Started implementation of metric configurations

Signed off by: Diego Araújo <diegoamc90@gmail.com>
Fixed metric configuration validations
Unit test for metric configuration model

Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Signed-off By: Guilherme Rojas V. de Lima <guilhermehrojas@gmail.com>
View to create new Metric Configuration.

Pending combobox to basetool, its metrics, reading groups and agregation form.
Still missing to some acceptance tests and fix the ownership helper to metric configuration controller.

signed-off-by: Fellipe Souto Sampaio <fllsouto@gmail.com>
signed-off-by: Renan Fichberg <rfichberg@gmail.com>
Fixed permission for metric_configuration

Signed off by: Renan Fichberg <rfichberg@gmail.com>
Choosing metrics from a base tool

Signed off by: Diego Araújo <diegoamc90@gmail.com>
New metric configuration feature

Routes for choose_metric & new metric configuration
Missing acceptance tests

Signed off by: Renan Fichberg <rfichberg@gmail.com>
Refactored mezuro configuration

Renamed variables in view and controller.
Renamed the helper of mezuro configuration ownership.

signed-off-by: Fellipe Souto Sampaio <fllsouto@gmail.com>
Index metric configuration feature

signed-off-by: Guilherme Rojas V. de Lima <guilhermehrojas@gmail.com>