Fixes KalibroConfiguration metric_configurations listing.

Overrides ActiveResource default route.

Signed off by: Diego Araújo <diegoamc90@gmail.com>
Fixed all_names method for MetricCollector

Signed off by: Diego Araújo <diegoamc90@gmail.com>
MetricCollector supported_metrics returns a list of Metric
MetricCollector metric method returns a instance of Metric

Signed off by: Daniel Paulino Alves <danpaulalves@gmail.com>
Changing the prefix options for reading

Signed off by: Daniel Alves <danpaulalves@gmail.com>
Overriding save and destroy methods for readings

Signed off by: Daniel Alves <danpaulalves@gmail.com>