[BUGFIX] Security Component prints null as logged in user to server log.
Added nexmo sdk dependency as a local maven repo.
Implemented SMS service using nexmo sdk.
Refactored code.
Formated the cita date and refactored the date formating utility.
Changed SMSParam of Paciente to Cita.
Changed sms message template.
Se creo un campo Boolean nuevo llamado enviadosms a tabla cita
se quito supresswarning de citapersistence
Merge pull request #15 from arigsela/BDDnueva

Se creo un campo Boolean nuevo llamado enviadosms a tabla cita