[FEATURE query-params-new] Fix failures in IE8.

IE8 does not allow `String.substr` to accept negative values. Replacing
with `slice` works well.

@raytiley / @rjackson
[FEATURE query-params-new] Fix issue with tests in IE8.

`DOMElem.classList` does not exist in IE8.

@raytiley / @rjackson
Merge pull request #4244 from rjackson/fix-qpn-in-ie8

[FEATURE query-params-new] Fix failures in IE8.
[FEATURE ember-routing-bound-action-name]

The `{{action}}` helper will now use a non-quoted parameter and perform
a bound property lookup against the action's target at the time the
event is triggered.

If a non-quoted param is used, but the property lookup returns
`undefined` a helpful assertion is made, and the specified parameter is
used as a plain string action name (thus preventing this from breaking
anyones applications).

Also, cleans up a few unrelated non-quoted uses of `{{action}}` in the
test suite.
Merge pull request #3936 from rjackson/bound_action_name_lookups

[FEATURE ember-routing-bound-action-name]