Updates the Readme
Updates the Readme

Adds Information in the Readme for:
* Testing
* Default Setup
* Customization Setup
* Required vs. Optional Attributes
* Methods for Optional Attributes
* SerializerIgnoreException
* SerializerMissingRequiredException
* Reporting Issues
* Development of the App
Closes #5

Signed-off-by: Justin Yost <0ce7911e6479995d6c346d6f03eb723b5135309e@loadsys.com>

loadsys/CakePHP-Serializers