feat(main): Add full image search functionality & update view based on input

* Add layout for RegCheck app
* Add validation directive for ensuring alphanumeric input only
* Read url properties and apply them to the site (ideal for copy and pasting)
* Add errSrc directive for handling successful and unsuccessful image loads
* validate charactersitics of regPlate and stockID to prevent unnecessary
  processing
* limit external domains to arnold clark image cache

KNOWN ISSUES:

* Tests are broken/incomplete & failing - running grunt test will fail
* Code is using hard coded url parameters
* modal dialog displaying 800px images is incomplete - refrained from pushing.
feat(README): Add installation and test details to README

* remove template about.js controller