Show feature

Pending acceptance test for listing all the ranges
Pending show template

signed-off-by: Renan Fichberg <rfichberg@gmail.com>
Started Range model

Pending unit test for beginning uniqueness validator

signed-off-by: Renan Fichberg <rfichberg@gmail.com>
Fixed MetricConfiguration unit tests
Routes & its unit test for ranges

Signed off by: Fellipe Souto Sampaio <fllsouto@gmail.com>