Add Utils to global.Cylon namespace, add bootstrap

This commit moves `Utils` to live in the global `Cylon` namespace, so they can be
accessed in test suites. This is necessary because Mocha, when setting up for
tests, will override our `#after` method, making TDR not work if any robots
contain a `#after` call in their work block.

To fix this, in test setup you can now call `global.Cylon.Utils.bootstrap();`
which will re-setup our globals.