Merge pull request #13 from paazmaya/master

Default value for diff should match the one of the main project - fix #8
add failing grunt task option in case of match - fix #9
Add reporter option and clean docs
Merge pull request #14 from stefanjudis/feature/9-fail-on-match

add failing grunt task option in case of match - fix #9
merge
Proper error message when configured report is invalid
Merge pull request #15 from paazmaya/6-report-option

Add reporter option