Merge pull request #4 from netceler/master

Possibility to add custom configuration
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
Handling complex parameters such as JSON structures