"Ready" changes

Resolves issue #2

• Client's recv method will now always be called after the client calls ready, even if the state is nothing but an empty object
• Client's recv method will be passed a boolean parameter to indicate that the update is in response to their ready call and not actually a "new" state

Checking for window and window.parent

Now checking for presence of window and window.parent before

operating on them.

Changed main script name to index.js

1.0.1

Renamed iframe-sync.js to index.js for easier importing.