version con usuarios y grupos
Merge pull request #2 from jcorta/master

config.properties
Merge branch 'master' of https://github.com/diogenes-moreira/issue-tracker
Merge pull request #3 from jcorta/master

agrego servicio para sacar usuario de grupo
Merge branch 'master' of https://github.com/diogenes-moreira/issue-tracker