Allow to define custom templates for inputs, errors, labels and hints.
Removing the `wrapControls` option.
Defining the `wrapperConfig` as a computed property.

This allows us to get the config easily, and makes the configuration
accessible to the templates.

For example:
```
<div {{bindAttr class="wrapperConfig.wrapperClass"}}>
my inputs
</div>
```
Including instructions about custom templates in the README.
Merge pull request #91 from diogomafra/custom-templates

Custom templates
Do not use `Ember.TEMPLATES` for template storage.

Allow template lookup in the following order:

* `Ember.TEMPLATES`
* `requirejs._eak_seen` (EAK & EAKR resolver)
* `EasyForm.Config._templates`
Merge pull request #79 from rjackson/dont_use_ember_templates

Do not use `Ember.TEMPLATES` for template storage.
Pulling the latest Ember and fixing our hack.