v1.4.1

Improvement

#137 Support Angular 1.4.x version
#180 Add code coverage using coveralls and write more tests
#184 Support compiling validation output message

New Featuers

#175 Add validation-group directive to support group validation, checkboxes, radios, text fields, and etc
#183 Support custom message element and update parameter for setErrorHTML() and setSuccessHTML()