Incorporate latest and daily into channels routes.

This PR dovetails with the new asset structure incorporated here:

https://github.com/emberjs/ember-dev/commit/921dc4ec825917ad5363edbf2213667fd2e9d7ee

Screenshots:

https://www.monosnap.com/image/UZopR7EXDhcLkivMoe2XmAtcY - /builds
https://www.monosnap.com/image/mADVz6UN4tSDKy0nETYiSquyp - /builds#/tagged
https://www.monosnap.com/image/qkIxH0n71TC7U26aCYMgLVOsN - /builds#/release/latest
https://www.monosnap.com/image/co3dPAOwHexoK463UvzA8wXrw - /builds#/release/daily

**Please note**

The Ember stable branch is not yet using the latest ember-dev version which publishes to the new structure (it is still publishing to builds.emberjs.com/stable/ instead of builds.emberjs.com/release).

The Ember Data repo is not using the latest version of ember-dev.  https://github.com/emberjs/data/pull/1156 has been created to correct this.