1. Passing JavaScript eval and other related actions to the CurrentFrame, not the MainFrame.
2. Added different methods to navigate between frames
3. With a call to "window.frames[0].focus()", the "currentFrame" changes: commands after that are sent to the new frame under focus.
4. The navigation between frames allows to walk over the "tree of frames" contained in the page.
This commit also adds examples (both in JS and CoffeeScript) and Unit Test.
http://code.google.com/p/phantomjs/issues/detail?id=573
Ivan De Marino