test(pageObjects): Added rxEnvironment Page Object

Added a page object for rxEnvironment. getEnv returns the current environment.
I'm doing the clone because all (as far as I know) of lodash's object-manipulation functions (`_.extend`, `_.defaults`, `_.merge`) have a side-effect of overwriting the first parameter passed to them.

I can't expect the user to need their core parameters object changed for all tests, so I clone first.