Some style changes to the extension preview page.
Added fade in effect.
Remove reference to url element.
Added timeline example.
Fix initial frame construction/excecution.
Loader: Don't lazily init the contentLoaderInfo field

We use it almost immediately after we create it, so this makes
no sense.
extension: Rename some loader variables

Make naming consistent between components.
extension: Clean up viewer code

Pass an arguments hash instead of a URL string. This allows
us to eventually pass movie parameters as well.
extension: Use the "flashvars" attribute to grab params from

Embed parameters are not passed to the movie.
Add support for passing movie params

In the case of the inspector, we simply use the entire query string
of the page if there's an "rfile" and pass it directly to the SWF.

In the case of the viewer, we parse the <embed>/<object> parameters.
We eventually may need to parse the query string after the src URL.
LoaderInfo: Add support for _getArgs

This is what's used; "get parameters" just calls this internally
and makes a copy.
Loader: Deduplicate and clean up timeline building
text: Text fields without fonts are defined to be 12pt serif

This is the default value emitted by the Flash authoring environment,
and it looks close enough to the real thing.
text: Don't skip rendering for initially-empty DefineEditText fields

For dynamic text fields, hasText only provides the initial value.
User code may set the field to say something else eventually.
TextField: Add support for replaceText
parser: Clean up comments

Make this match the comment for Multiname.fromSimpleName
parser: Rename Namespace

Firefox has a native class called Namespace, from E4X, that
conflicts with Shumway's own Namespace class. Rename it to
prevent collisions.