Unicode fixes, basic input/printing of unicode works.

Add detailed note about how to finish refactoring run_cell.

Implemented %loadpy magic for loading .py scripts into Qt console.

Implementing kernel status messages.

Safe kernel killing in Windows.

Cleaned up frontend-level kernel restart logic.

Integrated the heart beat pausing/unpausing logic with the (Qt)KernelManager.

Fixed font changes not being propagated to CallTipWidget.

Rename 'instant_death' to 'now' as per code review.

First pass at unicode support in ConsoleWidget. The widget now accepts and correctly sends unicode characters. However, there are serious kernel-side problems.