#137 OccurrenceState

1. Added entity OccurrenceState
2. Added changelogs and default records for OccurrenceState
3. Small refactor on UniqueValidator.java
4. Added internationalizationsinternationalizations keys values
5. Added jsps for the OccurrenceState CRUD
6. Added OccurrenceStateBean
Merge pull request #143 from efraimgentil/master

#137 OccurrenceState