Unify how we reference class and template paths in comments
Remove references to $components in favor of loadComponents where possible

Only performed for EN docs, as translators will better know how to modify the other docs.
Fix template links

We were specifying controllers in some places and not in others. This should make copy-pasting simpler
Fix reference to route specification

Now that we have route scopes, the `Router::connect()` example is invalid
Move comment out of php block
[fr] add french translation
Merge pull request #1887 from cakephp/3.0-doc-updates

3.0 doc updates