Added the support for the CLI options.
Added the support for the CLI options.

This fixes #5.

Signed-off-by: Taku Fukushima <d385cb54d860d8a5dcc6157b54cf213091772451@gmail.com>

ronaldlokers/grunt-casperjs,davidosomething/grunt-casperjs,guardian/grunt-casperjs,codice/grunt-casperjs,ryanmcdermott/grunt-casperjs