Add support for casperJS 1.1
Add engine parameter
Fix Readme formating for 'engine' parameter
Check CasperJS version number in order to generate compatible command for version >=1.1.0
Formating
Revert "Formating"

This reverts commit 5837cf73b95978ae181cdd2dcf88254887a933bc.
Formatting
Use the 'test' command only for version >= 1.1
Merge pull request #5 from ngirot/master

Support for CasperJS 1.1.0Beta1