Replacing Savon by faraday gem

Still missing fix the request and tests

signed-off-by: Renan Fichberg <rfichberg@gmail.com>
Project working and faraday_middleware used instead of just faraday
Model unit tests are passing
Model is_valid? covered with unit tests
BaseTool working
Configuration working
MetricConfiguration working
MetricResults working
ModuleResult working
Processing working
Ranges of working
Reading working
ReadingGroups working
Fixed a step for range entity.

signed-off-by: Diego Araújo <diegoamc90@gmail.com>
signed-off-by: Fellipe Souto Sampaio <fllsouto@gmail.com>
Merge branch 'faraday' of https://github.com/mezuro/kalibro_gatekeeper_client into faraday
Ranges working

Signed off by: Diego Araújo <diegoamc90@gmail.com>
Repository working

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
Release fixes
travis script adapted
Reading working