#139 Action to search

1. Action to search a occurrence
2. Added search form to the layout.jsp
3. Refactor of the occurrence list to handle a wrong search
4. Change the ValidationMessages to internationalization ( was working only in pt_BR )
#139 Find occurrence by id (number)

1. Finding a occurrence by the number
2. Added validation to the number in the search
Merge pull request #142 from efraimgentil/master

#139 Search Occurrence