finalized license headers on compiler sources (fixed issue #1226)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6079 f16182fa-f095-11de-8f43-4547254af6c6
FileSystem.createDirectory now automatically creates intermediate directories (fixed issue #1271)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6080 f16182fa-f095-11de-8f43-4547254af6c6