Prevents arguments from leaking
Merge pull request #5400 from twokul/leaking-arguments

Prevents arguments from leaking
Update Morph to latest version.

Compare view:

https://github.com/tildeio/htmlbars/compare/1a4d5985824f4df23bb6e78829e442fe368937aa...7889d3f4d2a979f8e32648c92afa033f1f32b434

This includes some perf fixes by Stef to allow Morph's constructor to be
inlineable.
Merge pull request #5448 from rwjblue/update-morph

Update Morph to latest version.
[Bugfix] improve performance of scheduleOnce/Once backburner.pushUnique:

more details: https://github.com/stefanpenner/backburner.js/commit/e33c10bbc884aec441e2f34a2d26211ff91a082d
Merge pull request #5450 from rwjblue/update-bb

Update Backburner.
[BUGFIX release] Fix minification of assets.
Merge pull request #5451 from rwjblue/fix-minification

[BUGFIX release] Fix minification of assets.
"Bad value context for arguments value" deoptimization in `String.fmt`.

This deoptimization occurs when you try to re-assign arguments passed
into the function.

Also, this change swaps slow `Array.prototype.slice` with `for loop`.

before:
![fmt-before](https://cloud.githubusercontent.com/assets/1131196/3981272/36463740-286c-11e4-8bbc-8d3dd80448e0.png)

after:
![fmt-after](https://cloud.githubusercontent.com/assets/1131196/3981279/410d61bc-286c-11e4-92d1-52bdb2d98f74.png)
Merge pull request #5453 from twokul/fmt-fix

"Bad value context for arguments value" deoptimization in `String.fmt`.