Clean up the JavaScript example.
Cleanups based on Peter's comments.
Cleaner steps for register, unregister, getRegistration.
Use specific errors. Resolve unregister with PushRegistration.
Run tidy.
Delete minor comments from example.
Address Peter's comments.
Run tidy.
Add viewport meta tag.
Add initial-scale=1.0
Merge pull request #23 from mvano/DOMException

Cleaner steps for register, unregister, getRegistration
Merge pull request #20 from mvano/JavaScriptExample

Clean up the JavaScript example
Merge pull request #37 from mvano/Viewport

Add viewport meta tag
Rename pushEndpoint to endpoint. Fixes issue #31.
Rename pushRegistrationId to registrationId. Fixes issue #30.
Fix merge conflict.