Modified binding_events to not use the Url addon.
Updated documentation for examples, removed one example, its documentation and test, updated binding example to not use the Url addon.
Added back the  example, documentation, and tests, updating the app.js to include 'app.map'. Also, moved the Url addon section for making URLs to the new routing chapter.
Merge pull request #1364 from zhouyaoji/docs-code_exs

[docs/code_ex] Updated steps and doc around `routes.json` in exs, removed one ex, updated another.