Exposed the previously Movie-internal class Layer.

Useful for doing things like modifying the hierarchy of a given layer at runtime in a Movie
subclass. I'm using this to add text fields to animated UI bits.
Merge pull request #69 from kpatelPro/artist-friendly-keyframes-good

Display artist friendly keyframe number in error log "location" column
Merge pull request #63 from kpatelPro/publish-error-msgs

Publish error msgs
Merge pull request #64 from kpatelPro/texturepacker-optimization

TexturePacker optimized by using BitmapData to implement _mask
Internalize a bunch of exposed classes.

These classes are not meant to be part of the public API. With this change, it is still possible,
through a bit of backbending, for an external library user to play with these bits and extend them,
but they will not show up in the public API docs.

It turns out that you can't apply a user-created namespace to an entire class (only to methods and
member variables), so this had to be done with internal instead.
Fix doc comments.
Make these three public again.

There is a method on LibrarlyLoader to set the CreatorFactory, which in turn exposes ImageCreator
and MovieCreator.  Either that method on LibraryLoader should be made internal, or these three
should be public again, which is the side I'm erring on here. I could go either way though.
Merge pull request #71 from roguenet/internalize-dirty-bits

Internalize dirty bits
Merge pull request #72 from kpatelPro/handle-no-frames-in-layer-safely

Handle "No keyframes in Layer" safely
Merge branch 'ignore-layer-folders-silently' of github.com:kpatelPro/flump
formatting; unused import
Merge branch 'preview-atlas-with-border' of github.com:kpatelPro/flump
conform to coding standards
Never terminate until we've shutdown.

The docs on isTerminated() claim that this should be the case, but as it was written, if the
Executor goes idle, then is given more tasks before shutting down, it was in a bad state because
it had already internally terminated.
Merge pull request #75 from roguenet/fix-executor-termination

Never terminate until we've shutdown.
SwfTexture uses DisplayUtil.applyToHierarchy
Merge pull request #65 from kpatelPro/swftexture-render-improvements

SwfTexture rendering improvements
Flash Builder project: use AIR 3.8
fetch from threerings