withIntent should properly set displayName

[nhunzaker]

That way it is easily selectable within Enzyme. Like:

let name = enzymeWrapper.find('withIntent(ComponentName'))

Fixes #205

[mackermedia]

👍

[coveralls]

Coverage remained the same at 100.0% when pulling da3261b on with-intent-display-name into 7712f38 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling a54941c on with-intent-display-name into 7712f38 on master.