-fix flex-sdk-description.xml to use regular expression to update and not copying files around so they could be updated
-moving flex-sdk-description.xml to the root directory from the collateral/en_US directory where it will be updated everytime someone runs ant main
-removed flex-sdk-description.xml from being deleted in the clean target
-fixed package target to not call clean, main - in order to get a package you now have to call ant clean main package. I also removed the repackage target since it is not used any longer.
I know there is some more clean up that can be done in here as far as packaging is concerned!