chore: Added testing tools
Added missing tests and manage for some error cases
Relocated spec to module
Merge pull request #5 from milo-ft/master-chore-testing_improvements

chore: Added testing tools to the project
Basic Config for Rails_api GEM
(partial-work) Devise Registers done.
Custom Classes for Devise  using REST API
(partial-work) Added some tests and several changes
Several Changes from last pull