Add missing properties to component

[notmessenger]

Add these properties to the component with appropriate default values:

name
readonly

[erangeles]

@notmessenger please assign me this.

[erangeles]

@notmessenger http://softlayer.github.io/sl-ember-components/#/demos/sl-radio there is also a label property, it currently is not a property in the component. should that also be added to the list to add?

[notmessenger]

@erangeles Oh yes, it should be.