Merge pull request #14 from wcwynn/v2.3

Failure callback fix.
Merge pull request #17 from wcwynn/v2.3

Updated wizCanvasView to handle application lifecycle notifications.
Upgraded to Ejecta 1.2

- Upgraded to Ejecta 1.2 (SHA d991c7d9f2546ee3c874c7a69f74d6f3f40ded8e)
updated custom view for postMessage receive object spec
updated custom view for postMessage receive object spec
removed JSON sringify - wizViewMessenger is doing now
updated custom view for postMessage receive object spec
fully resolved postMessage to wizViewMessenger
Update README.md
Update README.md
Added support for loading from a URL for canvas view type.
Minor refactor of canvas loading code.

- Moved common loading code into one method.
- Modified loadRequest to return a boolean indicating success or failure.