raised version to 1.5.1-SNAPSHOT
exchanged references to HTTPStatusEvent.HTTP_RESPONSE_STATUS with custom constant (closes #545)

This constant is not always available in pure Flash.
raised version to 1.5.1
updated SWC for 1.5.1
updated changelog for 1.5.1
updated maven pom.xml for v1.5.1
starting development on v1.5.2
added 'color' property to the Button class
optimized TextureAtlas.getNames by caching sorted list of names (closes #548)
updated README with more information about cross-platform deployment
added method to get all contained char IDs from bitmap font (closes #554)
added 'hasChars' utility method (closes #347)
now conserving 'onReady' texture option when loading ATF texture (closes #555)
avoiding 'slice' when possible (refs #493)
added 'over' and 'disabled' states to Button (refs #549)
fixed bug introduced with previous AssetManager change

At the same time, this change allows to change the texture settings while filling up the queue.
In the following sample, the first bunch of textures will use mipmaps, the second bunch won't.

    assets.useMipMaps = true;
    assets.enqueue(appDir.resolvePath("textures/with-mipmaps"));
    assets.useMipMaps = false;
    assets.enqueue(appDir.resolvePath("textures/without-mipmaps"));
added 'textureFormat' property to AssetManager; added more ASDoc 'default' infos
optimization in 'DisplayObject.removeEventListeners' (refs #493)
small 'advanceTime' optimization in MovieClip (closes #558)
added 'overlay' sprite to Button class (closes #559)