Updates to key presses

Particularly please notice the KeyModifier for shift presses.

eg

scr.type(Key.TAB, KeyModifier.SHIFT)

rather than

scr.keyDown(Key.SHIFT)
scr.keyDown(Key.TAB)
scr.keyUp(Key.TAB)
scr.keyUp(Key.SHIFT)

I also removed the screen click before pressing escape. That could screw your tests up a little! :p