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.)
Merge pull request #691 from arthurevans/docs-565

Additional fixes for #565.