Reading exists? method

Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Methods all, find and exists? for range entity

Missing acceptance test
Signed-off By: Guilherme Rojas V. de Lima <guilhermehrojas@gmail.com>
Accepctance test for all method of Range entity

Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Acceptance test for range entity

Signed-of By: Renan Fichberg <rfichberg@gmail.com>
Merge branch 'reading_exists' into dev
Update gem version

Signed-of By: Renan Fichberg <rfichberg@gmail.com>
Update savon and active_support version

Signed-of by: Renan Fichberg <rfichberg@gmail.com>