Download AS to target/as-dist to make further setup actions easier.
Set org.jboss.loom.MigratorApp as main class for the dist archive.
Update logging conf
Support multiple apps on params.
Allow params without --
Update usage text to be clear about AS 5 and AS 7 dirs.
Fix NPE
Any param starting as5. or as7. is now also settable as:
[as5|eap5|srcServer].xxx
[as7|eap6|targetServer|wfly].xxx