store file sorting options in the browser's LocalStorage
Set default instance name to empty string
New option to sort gcode files by size, reverted former utc "fix" (doesn't work anymore, works without the fix, I have no idea...), added adjusted modernizr,  delete metadata from old gcode file version when adding a new one
Merge branch 'daprice-sorting_persistence' into devel

Conflicts:
	octoprint/static/js/ui.js
Refactored pagination/sorting/filtering of gcode files into own configurable listHelper now used to provide pagination etc to both gcode and timelapse file list.
Playing around with less...
The jog controls aren't ugly any more and we have some more stuff than just jog controls now
Fix up for less support