Deleted useless duplicate service
AbstractDataEventForwarderParserService
Refactored AbstractDataEventParserForwarderService as an extension of
AbstractService
Refactored AbstractDataEventListenerService 

- removed overriding of "run"
- implements "serve" as a call to abstract method onTakingEvent
Added AbstractTextFileTransformationService

This class is an helper implementation that eases by subclassing the
definition of text file transformation services
Added JsonFileTokensRemoverService

service that removes all specified tokens from a JSON template file
Refactored an renamed JsonFilteredFileProducerService

- refactored as an extension of
AbstractTestFileTransformationService
- removed token removal code (the service is supposed to wok on
tokenless files)
Added a period in AbstractService

the call to "serve" is automatically performed at a given period
Fixed core services implementations according to AbstractService
refactoring
Fixed ubpe2011 services implementations according to AbstractService
refactoring
Fixed ubpe2012 services implementations according to AbstractService
refactoring
Fixed ubpecommons services implementations according to AbstractService
refactoring