Small code refactor

* Simplified employees call when searching by id
* Renamed specs for better readability
Added new Hashie::Mash#pick method
Simplified employees#put API call
Merge branch 'master' into code-refactor
Added coveralls post hook
Added coveralls gem
Removed cuveralls command from post call for circleci
Removed artifact for coverage in favor for coveralls service
Tweaked the spec_helper to sue coveralls formatter
Added coveralls badge to README file
Added blank line in README
Removed the wear! method call from coveralls
Tweaked spec_helper for coveralls config
Removed extra blank lines
Removed extra blank line
Merge pull request #4 from AxionTecnologia/coveralls-integration

Coveralls integration
Merge branch 'master' into code-refactor
Corrected sample text
Merge pull request #3 from AxionTecnologia/code-refactor

Code refactor
Merge branch 'master' into reports-endpoint-implementation

Conflicts:
	Gemfile.lock
	config/application.rb