Refactor CORSFilter to only add Access-Control Header fiels if request
is OPTIONS
1) Enhance CORSFilter to incorporate grails-cors routine
2) Rename LongToStringFilter to StringToLongFilter to better represent
what the filter does
1) Add BrandsEye as a contributor
2) Correct issues with CORSFilter JUnit test
Merge pull request #34 from dfcoffin/master

Refactor CORSFilter to only add Access-Control header fields if request is OPTIONS