Updates to the README and build process.  This includes the following changes:

- Use a simple HTTP server when testing out Flash.  Given wacky security settings, Flash can sometimes not behave as you expect when running locally.
- Build from Apache Flex.  This is the latest version of the SDK and more open source friendly.
- Recent changes in Apache Flex allow another change, which is to target an earrlier version of the Flash Player, 10.3.  There's nothing in use that requires the targeting of Flash Player 11- this was just forced on all projects with the last version of the Adobe SDK.
- Make the bin-debug folder (for IDE use) and bin-release folder (for shell use and final bit building) easier to use by populating them with a demo file that works and files in video.js
- Remove old VideoJS.swfs that aren't in use.  (They were old, definitely not the latest version.)
- Don't make anyone change build.sh