Add back ability to format Objective-C code

Author: danieltabacaru

.clang-format

@@ -1,5 +1,6 @@
 ---
-Language:        Cpp
+# Don't try to format any languages not described by this file
+DisableFormat: true
 AccessModifierOffset: -4
 AlignAfterOpenBracket: Align
 AlignArrayOfStructures: None
@@ -65,7 +66,6 @@ ContinuationIndentWidth: 4
 Cpp11BracedListStyle: true
 DeriveLineEnding: true
 DerivePointerAlignment: false
-DisableFormat:   false
 EmptyLineAfterAccessModifier: Never
 EmptyLineBeforeAccessModifier: LogicalBlock
 ExperimentalAutoDetectBinPacking: false
@@ -191,5 +191,11 @@ WhitespaceSensitiveMacros:
   - BOOST_PP_STRINGIZE
   - NS_SWIFT_NAME
   - CF_SWIFT_NAME
+---
+Language: Cpp
+DisableFormat:   false
+---
+Language: ObjC
+DisableFormat:   false
 ...