Add to README: instructions on building with mxmlc and how to server crossdomain.xml with netcat.
Add to README: instructions on building with mxmlc and how to server
crossdomain.xml with netcat.

arlolra/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy,arlolra/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,infinity0/flashproxy,arlolra/flashproxy,arlolra/flashproxy