Merge pull request #111 from whymarrh/develop

Update contribution guidelines
Merge upstream develop into develop
Remove develop brancn build status
Add linkt to GitHub Guides
Add link to JSHint
Fix link to contributing document
Small grammar fix
Add link to PHPUnit website
Add `use` statement for `LookupTest` modules tests
Add Mockery to project
Move ID traits in the same namespace as the entities

Also note: `Trait` is a keyword.
Add basic tests for entities