Implementations of chrome.system.cpu|display for ios

- Add auto tests for chrome.system.cpu plugin
- Initial stub implementation of chrome.system.cpu.getInfo for ios
- Add auto tests for chrome.system.display plugin
- Implementation of chrome.system.display.getInfo for ios
I'd vote for 1.1.0 here -- Adding iOS is pretty significant (more than a bug fix :), but still backwards-compatible with 1.0.1 (so doesn't need to be 2.0.0)