Separated Calcium.Helper to it's own file

Added Calcium.Helper to it's own file, as it is uncessecary in many
situations, and really only should be used in specific situations. Calcium
will go on it's own providing more fundamentary functionality, and
Calcium.Helper will simply provide quick and easy methods to use that
functionality.
Added a build-function to the helper class.

Instead of manually calling `Helper.enableHelpers()`, running the wanted
code, and then calling `Helper.disableHelpers()`, the same can be achieved
by calling `Helper.build(function() { // build code here })`.
Merge branch 'calcium.helper'