Responsive plugin v0.2 items

[mattpass]

Once v0.1 items have been covered, other items to look at:

Bugs:

• Create a breakpoint at 800px, then 450px, then 750px. You can't see 450px anymore

Enhancements:

• Can't easily select child item if parent selected
• Child nodes have junk items built up, need to set widths on them also
• Display the current width on resize of window
• Need to be able to remove responsive bars
• Highlight the active bar
• Hide Add button if we have the window width currently set to breakpoint