Convert from Prototype to jQuery
Parameterise field width
Recalculate for area keypress
Remove Guardfile comments
Move scripts to their own directory
Add CoffeeScript compilation
Encapsulate form watching in preparation for multiple walls
Extract imperial multiplier
Fix reverse calculation of distance from area percent
Extract access to area field value
Clear distance when area changes
Ignore field key events from shift and tab
Move from IDs to classes to prepare for multiple walls