add ccdict.go for Credit-Control Applications
rename variables to be more descriptive
add credit_control dictionary from http://tools.ietf.org/html/rfc4006#section-8
add Credit-Control Request and Credit-Control Answer messages to credit_control dictionary
document using custom parsers to load multiple dictionaries. Closes #4
remove duplicate AVP rule in credit_control dictionary
annotate credit_control dictionary with RFC links
document loading more dictionaries into default parser
Merge remote-tracking branch 'upstream/master' into cc_dict
add name to contributors file
Merge pull request #3 from dwilkie/cc_dict

Dictionary for Credit-Control Applications