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 call global.Cylon.Utils.bootstrap();
which will re-setup our globals.
Merge pull request #154 from hybridgroup/global-utils

Add Utils to global.Cylon namespace, add bootstrap