new option for require.js (addresses Issue #36)

new option for specifying custom path to  (relative to _SpecRunner.html)

example:

    options: {
        outfile: "custom/path/to/_SpecRunner.html",
        specs: "path/to/spec/*Spec.js",
        template: require('grunt-template-jasmine-requirejs'),
        templateOptions: {
            requireFile: "../js/libs/require.min.js", //relative to outfile
            requireConfigFile: ['path/to/src/config.js' ],
            requireConfig: {
                baseUrl: '../src/'
            }
        },
    }