Feature/NTA_Restapi

Added JBoss Copyright message to all files.
Updated the file header template.

Changed the context of webapp and restapi modules.
Discarded use of LinkBuilder class and implemented custom REST link generators.
Updated the TransactionInfo Model to adhere to the change of REST links for an entity.
Updated the TransactionService to return better response objects to API level.
Updated API to return 204 status if no content is found.