Respond appropriately to screen edge

[JordanMagnuson]

Guider content should strive to always remain within the screen, while sill pointing to the desired selector.

Check out this screenshot: http://i.imgur.com/ugoblq4.png

I want the guider there to be positioned as it is, below the selector (rather than to the right), but I want it to stay within the screen.

[jwg2s]

:+1:

[DanielStevenLewis]

+1. This bug prevents development of mobile responsive guided.

[DanielStevenLewis]

Guiders can also go off the screen vertically.