Merge pull request #1 from camerond/master

Merge of commits 572527e and ec78e2e
Update to 1.7.2
Move internal functions to methods on parent plugin object
Complete rewrite, setup middleman
Vertically center modals
Add modal container override back in
Update docs, center modal only when room is available
CoffeeScript rewrite
Fix syntax errors, use string interpolation
Prevent error when show called without argument
Add option for assigning close keys, beforeClose callback created
Create means to generate singleton modal, add context option
Add Ajax options for greater control when not using an anchor as a trigger
Replace jQuery 1.7.2 with 1.9.1
Add options object to specify which actions receive close action