Switch to YUIDoc for API docs.

Squashed commit of the following:

commit 5b6bffb9399c1dd05ca394d4db3b907a2e1026f5
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Nov 3 20:44:29 2014 -0600

    Build v.1.4.1.

commit 7edecbd7803591ceee2a2ad36137c7f970cf78cf
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Nov 3 20:41:14 2014 -0600

    Set up redirects for old API doc pages.

commit ace1b0791379adcd264ff4d8e02d471eb7829b5e
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Nov 3 20:13:56 2014 -0600

    Set up custom documentation logo.

commit f36f03817358952545ce44b6acbea5fb7d5cb0d4
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Nov 3 19:48:22 2014 -0600

    Wire up grunt-contrib-yuidoc, drop grunt-dox.

commit b4cbe52055199be4fb93af779304097102615c1f
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Nov 2 17:58:33 2014 -0600

    Lots of doc improvements to renderers/canvas/rekapi.renderer.dom.js.

commit 65757d5fe941a9ef9206784b2cd07575e8b8ef8d
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Nov 2 16:40:04 2014 -0600

    Lots of doc improvements to renderers/canvas/rekapi.renderer.canvas.js.

commit 0cccbd3a52927694ca4768ee7254994279b85ce9
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Nov 2 15:52:13 2014 -0600

    Lots of doc improvements to src/rekapi.keyframe-property.js.

commit 42c432c9bb98a1ccda5ce0970f24cacc91cd8ee3
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Nov 2 12:44:38 2014 -0600

    Lots of doc improvements to src/rekapi.actor.js.

commit 3904d68ff252e8fae5b836e0a729c78ea8be069b
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 17:57:46 2014 -0500

    Lots of doc improvements to src/rekapi.core.js.

commit 8ef5858c3cd430cc55abfbd165c5722dd993d9fd
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 16:40:13 2014 -0500

    First-pass YUIDoc conversion for rekapi.renderer.dom.js.

commit b94feeb7fccbdf9560d1b42f8945da3d51f65ab0
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 16:21:43 2014 -0500

    First-pass YUIDoc conversion for rekapi.renderer.canvas.js.

commit a5502261647ab54186e2d8ca52cf98934296893b
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 16:12:40 2014 -0500

    First-pass YUIDoc conversion for rekapi.keyframe-property.js.

commit d149a1485e7c94bc961eb92a30717d3fc450e0d1
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 12:41:09 2014 -0500

    First-pass YUIDoc conversion for rekapi.actor.js.

commit 0ed139b03b3e785734dbf2b6ef27785a516c1380
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Nov 1 12:26:57 2014 -0500

    First-pass YUIDoc conversion for rekapi.core.js.