Fixes issue #147

The flux lexer was failing on files which had an empty comment not followed by a
new line as their last line.

Author: cboehme

src/main/antlr3/org/culturegraph/mf/flux/parser/Flux.g

@@ -1,5 +1,5 @@
 /*
- *  Copyright 2013 Deutsche Nationalbibliothek
+ *  Copyright 2013, 2014 Deutsche Nationalbibliothek
  *
  *  Licensed under the Apache License, Version 2.0 the "License";
  *  you may not use this file except in compliance with the License.
@@ -251,10 +251,14 @@ LINE_COMMENT
     '\n'
     | '\r'
    )*
-  '\r'? '\n' 
-            {
-             $channel = HIDDEN;
-            }
+  (
+    '\r'? '\n'
+    | EOF
+  )
+  
+  {
+    $channel = HIDDEN;
+  }
   ;
 
 WS