[BUGFIX beta] Update route-recognizer to v0.2.8.

[nathanhammond]

Changes in this version account for edge cases which result in undefined behavior in route-recognizer:

• Throws errors when params would result in problems. tildeio/route-recognizer#116
• Prevent clobbering of existing named routes. tildeio/route-recognizer#118

Should be backward compatible but making sure that we get most of a canary cycle with eyes on this.

[nathanhammond]

There is one actual Ember bug: we appear to recalculate link-to's href during teardown if a bound param into the link-to component is torn down prior to the link-to being torn down. The upstream changes throw an error if you attempt to generate a URL without all of the specified params, so in combination it now throws an error.

I haven't finished tracing that issue. As this is actually a separate and different issue it will come separate from this PR. Depending upon how complicated and invasive that fix is will determine if I tag it as a [BUGFIX release|beta].

[nathanhammond]

After building the test the {{link-to}} helper does not throw an error if its route has exited as an application I have discovered that the test itself is invalid. I've modified the test to do what it was originally intending to accomplish (confirm that we don't tear down controllers) and made the test pass.

I could not produce the failure of my original hypothesis (which is why I was delayed in addressing this).

[rwjblue]

Thanks @nathanhammond!