Fix external directive parsing logic (fix #15)
Fix external directive parsing logic (fix #15)

RomanYankovsky/DelphiAST,Wosi/DelphiAST,monkeyxu/DelphiAST,uschuster/DelphiAST,NickRing/DelphiAST,vintagedave/DelphiAST,AmesianX/DelphiAST,LaKraven/DelphiAST,Wosi/DelphiASTTemp