Fix bug with XUnit reporter

Passing grunt options to Reporter instance that may have reporterOptions property. It’s required for XUnit reporter.
Overriding the whole XUnit from mochajs due to bugs with test.isPending() methods. As described in:
mochajs/mocha#2297
kmiyashiro#163

Update dependencies

PhantomJS updated to 2.x

Update dependencies

Blanket to 1.2.x
Mocha to 3.x