Fixes for initial setup and for packaging up less files

I wanted to make sure we had less files packaged up with npm pack here, as there's a huge number of files that were being included here that weren't needed.  I ended up making a few extra changes as I tried the README that I haven't looked at in a long time.  Changes include:

1. Change npmignore so that only README and dist/video-js.swf are included
2. Remove extra lines in README so that there's an ordered list instead of "1." many times
3. Change testing section in README to reflect what's really there now
4. Change index.html to indicate that the automated tests aren't working from the given link right now
5. Update package.json's flex-sdk version to something that works.  This is the number on npmjs.org, while the version that was in there was giving a 404

The two things I didn't fix that I saw were that the automated tests don't work out of the box, looks like some files that were used/copied before aren't there anymore.  I just put a note on that.  The second thing is that I didn't get the "Sandbox" link in index.html, which just seemed to be a blank page for me.