feat(directive): ngName

Create ngName directive.
Currently input name attributes cannot be evaluated.
This is because of the task of handling adding and removing controls to
parent FormControllers.
NgName handles evaluating the name safely without risking unintended
manipulation later.
It prevents changing the existing controllers and directives and
therefore contains no risk to the current source.
It simply evaluates the expression and makes the changes prior to ngModel link
execution.
This does not handle adding or removing controls... (yet)
Merge branch 'master' of https://github.com/sjbarker/angular.js