adding simple validator mock
keeping SimpleValidator dependencies private and creating a method to create SimpleValidatorMock
Merge branch 'master' into ok-adding-simple-validator-mock

Conflicts:
	src/main/java/br/com/caelum/vraptor/simplevalidator/SimpleValidator.java
refactoring to keep old code style
Merge pull request #16 from nykolaslima/ok-adding-simple-validator-mock

adding simple validator mock