Add the grunt task to run the tests on Siesta Lite. (senchalabs/AppInspector#61)

* It Starts a connect web server for running the tests on Siesta Lite.
* It opens the Siesta's test page in your default browser.
* The port number will be used in 8333, but if you have already used it, please change it as you like.
Merge pull request #74 from kawanoshinobu/pullreq

Add the grunt task to run the tests on Siesta Lite.