Merge pull request #2270 from mihailik/patch-1

Fix for #2268 createDiagnosticCollection should be @internal

Author: mhegazy

src/compiler/utilities.ts

@@ -1207,6 +1207,7 @@ module ts {
         }
     }
 
+    // @internal
     export function createDiagnosticCollection(): DiagnosticCollection {
         var nonFileDiagnostics: Diagnostic[] = [];
         var fileDiagnostics: Map<Diagnostic[]> = {};
@@ -1336,4 +1337,4 @@ module ts {
             s.replace(nonAsciiCharacters, c => get16BitUnicodeEscapeSequence(c.charCodeAt(0))) :
             s;
     }
-}
+}