Adding a "variable" option for JSONP

We can now either require a callback to be returned or we can choose to have the JSON value set in a variable. Example: var myvariable = {"foo": "bar"};
Moving the GPG signing plugin to a specific deployment profile
Providing a way to intialize the variableParameter and callbackParameter names via constructor or setter.

This feature is a simplification for those who use Java Configuration (without web.xml).
Upgrading to servlet API 3.0.1