clang-format: Add more options to namespace indentation.

With this patch, clang-format can be configured to:
* not indent in namespace at all (former behavior).
* indent in namespace as in other blocks.
* indent only in inner namespaces (as required by WebKit style).

Also fix alignment of access specifiers in WebKit style.

Patch started by Marek Kurdej. Thank you!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187540 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/UnwrappedLineParser.h b/lib/Format/UnwrappedLineParser.h
index 0624c4f..d23d157 100644
--- a/lib/Format/UnwrappedLineParser.h
+++ b/lib/Format/UnwrappedLineParser.h
@@ -65,7 +65,7 @@
 private:
   void parseFile();
   void parseLevel(bool HasOpeningBrace);
-  void parseBlock(bool MustBeDeclaration, unsigned AddLevels = 1);
+  void parseBlock(bool MustBeDeclaration, bool AddLevel = true);
   void parsePPDirective();
   void parsePPDefine();
   void parsePPIf();