Added metadata.xml file for completion in Flash Builder 4.5+

Note that I did not test this using Maven compilation. The only thing
to do is include this file as a static resource in the library.
Moving metadata.xml file to the right directory

Sorry for the inconvenience, first-time commit in GitHub...
Merge pull request #29 from avangel/master

Added metadata.xml file for completion in Flash Builder 4.5+