Updates for Xcode 5.1, fixes, and features

* Addressed new behavior in Xcode 5.1 that refers to simulators as "devices" now, on the `instruments` command line.  (Warning, won't work with Xcode 5.0)
* Added `.equals()` method for UIElement comparison
* Added the ability to dump the javascript code to access every UIElement (w/ option for just the visible ones)
* Added `waitUntilAccessorSelect()`, which allows checking for multiple screen elements in parallel and returning the first one that is successfully found.
* Added the ability to see abbreviated output in the console with `-b` or `--brief`
* Remove extensions to `Object.prototype`, because it was buggy (and dangerous); they are now just functions that take the object as an argument.