TravisCI: all targets enabled!

Enabled the remaining targets for TravisCI: flash8, flash9, as3.

It uses the standalone flash player debugger 11.2 to run the swfs (sightly easier to install than air). Test results are read from flashlog.txt.
To compile as3, it uses mxmlc from Apache Flex SDK 4.11.

Hope the failing targets will be fixed soon as it doesn't look good to have 4 out of 10 targets failing unit test...
You know, putting them in `allow_failures` is kind of cheating ;)