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

Code refactor