Prevent mousemove spam

Some platforms produce frequent mousemove events whether or not the mouse has moved. This causes the UI to always be displayed since userActive_ is always `true`. By keeping track of the last mouse position and only firing if the new position is different, we can eleminate the event spam.
Basic UI for Live

Squashed commit of the following:

commit 2c5d4d523e2e1f3a1bcdafda292d6a0ebea7a200
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Tue Apr 1 15:02:37 2014 -0700

    update control text for liveDisplay component

commit 10f21cc2a09b6823a73fae4cf1881490f9038d30
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Tue Apr 1 12:23:20 2014 -0700

    whitespace fix

commit 6a093d67989479f63ed4ac6bdddd5d1a3d0b08bb
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Tue Apr 1 12:21:42 2014 -0700

    remove window scope of infinity

commit 2dd8284bd3c7b2c7692a78563c3cfe9558f25ab4
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Tue Apr 1 12:12:13 2014 -0700

    update to fix infinity capitalization. only do css logic on valid duration. set any duration of less than zero to window.Infinity

commit f940bef8b50156c5b8fcd969c9b5d39be9fe5589
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Tue Apr 1 10:01:27 2014 -0700

    update to less than zero on player durationChange

commit 554c003dac640b7a658355cd46b6ab146cf50b24
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Mon Mar 31 17:26:13 2014 -0700

    update exports, fix tests

commit 2fb10cb06a65c3f91342563bfa925d9a472ede33
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Mon Mar 31 13:39:00 2014 -0700

    fix tests, remove update display list in LiveDisplay

commit bc47c5ed67e036c79067ebc6666b310fd0b68d04
Author: Tom Johnson <seniorflexdeveloper@gmail.com>
Date:   Mon Mar 31 13:13:43 2014 -0700

    Basic UI for Live
Added line to the changelog
Making sure that the title element gets placed into the UL element

Included are two sanity check tests for the two areas being checked
to make sure that the menu title items are being correctly placed
in the actual UL element of the menu.

Fixes #1107
Reset player on source change. closes #1050 closes #1124
Don't force sliders to get evaluated on load. closes #1122

Squashed commit of the following:

commit d5957da3b282166c882c5d81e64936dec118ecf6
Author: David LaPalomento <dlapalomento@gmail.com>
Date:   Mon Mar 31 16:22:43 2014 -0400

    Peg the volume control to 1.0 on init
    Setup styles so that the volume control initially renders at full volume. This matches browser behavior where volume is available and saves Javascript from having to manually update the volume control on init. After the initial draw, the volume control is updated dynamically the same way it was before.

commit 8bc861fb861d4126f80fd11ed17d1f550498c559
Author: David LaPalomento <dlapalomento@gmail.com>
Date:   Wed Mar 12 17:16:30 2014 -0400

    Don't force sliders to get evaluated on load
    Since the load and play progress sliders are guaranteed to start from zero, set that through CSS. Calling Slider.prototype.update forces a re-flow because element dimensions are queried and style rules changed. That reflow consistently took around 60ms on my laptop which would mean dropped frames and "jerkiness" on initialization.
Updated volume slider to use ems intead of percent for default value clarity
Merge branch 'feature/fix-menu-title' of git://github.com/coursera/video.js into coursera-feature/fix-menu-title
Adjusting menu to use title given in options
getElementsById -> getElementById

small typo fix in code that leads to error
Merge pull request #1130 from stin7/patch-1

getElementsById -> getElementById
Updated versioning to bump bower and component json files also

fixes #1123, fixes #1140
Release 4.5.2
Merge branch 'stable'

Conflicts:
	dist/video-js/video-js.css
	dist/video-js/video-js.min.css
	dist/video-js/video.js
Merge branch 'master' of github.com:videojs/video.js
Merge branch 'feature/fix-menu-title' of github.com:coursera/video.js into coursera-feature/fix-menu-title
Making sure a tech exists when starting manual progress and timeupdate events
Trigger one last timepudate when stopping manual timeupdates. fixes #1002
Merge branch 'mousespam' of github.com:download13/video.js into download13-mousespam
Merge branch 'feature/tech-error' of github.com:heff/video-js into heff-feature/tech-error