Cleanup of the class

[ameech]

• Added a namespace
• Updated comments to a better format
• Updated some private variables to protected so it can be extended

[dolfelt]

Let's ditch the [] for now since those are only available in PHP >=5.4. Let's increase requirements to >=5.4

Also, could you add the PSR-4 configuration to the composer file?

[shadowhand]

@dolfelt PHP 5.3 is EOL since August 2014, do we really need to continue to support it?

[shadowhand]

I think we need a sub-namespace for every project/library:

namespace Wheniwork\Api;

[ameech]

Made a new PR. #3