Added platform specific package creation.
Removed launcher from toolkit jar, they still exists on workspace src and classpath.
Removed excess sources from demo.
Removed tests.
When creating release use only "package-*" targets:
package-all-platforms, package-windows, package-linux or package-mac.
NOTE: This build script requires directories named build/gwt/(gwt|linux|windows|mac) .
It's best that you unpack platform specific binaries under linux, windows and mac directories and
then depending on your platform link build/gwt/gwt -> build/gwt/<my_platform>
build/gwt/gwt is used to compile WebContent/ITMILL/widgetsets (depends on your platform, hence we use "gwt") and
build/gwt/(linux|windows|mac) are used when creating platform specific release ZIP/TGZ packages.
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