Additional fixes for #565.

-   Escaped binding expressions.
-   Cleaned up wording a bit.
-   Tested code in jsbin and added some clarifications
    based on things that were confusing to me. (In particular, the second
    version of `<app-globals>` doesn't work with the previous
    `<my-component>`, and configuring the element with camelCase
    attributes is confusing because the actual property names end up lowercase.)