BREAKING CHANGE
* removing `onChange`

FEATURE
* adding three events: $beforeRouteChange, $afterRouteChange, $routeReload

In order to avoid unnecesary route reloads when just hashSearch part
of the url changes, it is now possible to disable this behavior by
setting reloadOnSearch param of the route declaration to false.

Closes #354

Change doc_widget.js to:

- render "edit in jsfiddle" button next to all examples
- make opt out certain examples by adding jsfiddle="false" attribute to
  doc:source element

we commonly assign stuff in if statments like this:

if (variable = someFn()) {
  //do something with variable
}

This results in lint and IDE warnings (did you mean ==?).

It is better to be explicit about our intention and wrap the assignement
into parens:

if ((variable = someFn())) {
  //do something with variable
}

Doing so suppresses warnings + is easier to understand the intention.

I verified that the closure compiler strips the extra parens, so there
is no byte overhead for this safety practice.

We should use this style going forward...

The support for the 'z' formatting flag was removed becase the timezone
info can't be retrieved from the browser apis (except for en-US locale
on some but not all browsers). For this reason we don't want to support
this flag at all.

Related to this, since the 'long' and 'longtime' datetime formats require
the 'z' flag in the formatting string, we are removing support for this
format as well.