Added: tasks can be sorted with drag'n'drop
Fixed: the form toggled each time a dnd action was performed
Fixed: a reorder was made when it was not necessary
Improved: the placeholder detection precision
Changed: the 'toggle new task form' button color to make it less flashy
Added: a shortcut to add a task before another
Refactored: proper coffee syntax
Fixed: the previous and next tasks were not set
Removed: useless event bindings
Updated: the public assets
Fixed: the dragover event was not fired in Firefox.
Refactored: using the nib's mixin for user-select instead of rewriting the code
Fixed: the sort is by DnD is now disabled in tag lists
Merge pull request #10 from jsilvestre/feature_sortable

Feature: tasks can be sorted with drag'n'drop