fixed markdown
ignore all files generated by dart2js
delete all files generated by dart2js
implemented low quality BlurFilter

unfortunately it's not really faster as the high quality BlurFilter. The
code looks simpler but in the end it's pretty much the same as the high
quality BlurFilter. We have to wait for more Dart2Js optimizations.
made low quality BlurFilter less blurry

now the low quality BlurFilter looks more like the high quality
BlurFilter for a given blur radius.
ParticleSystem, GlassPlate, Warp

This is mainly an experiment with the particle system originally
implemented by the Starling framework. We also created a "displayEx"
folder for DisplayObjects which are not part of the original Flash API.
fixed start/stop of ParticleSystem
simplified mask calculation in Gauge.

before we took the width and height of the bitmap, which is a much more
complex operation. But in fact we only need the width and height of the
bitmapData!
moved redundant code into helper function
only ParticleSystem should be public
use "as" cast operator to specify types from json

maybe this help dart2js to produce better code in the future.
fixed bug in Particle sample

When switching between the different particle systems, we didn't stop
the previous particle system and burned a lot of CPU.
fixed another bug in the Particle sample

stupid me, didn't see the real bug at first.
replaced deprecated Math class
added wiki and blog reference
fixed a code analyzer warning

This warning occurred with the latest Dart Editor build, no big deal.
prepare XMLHttpRequest to HttpRequest renaming
updated new getter syntax and (XML)HttpRequest
match up with the lastest changes of Dart
removed old firefox workaround

also fixed a new warning from the analyzer:
renamed constructor Matrix.identity() to Matrix.fromIdentity()