Bug 1322321 - Update the clang format file to match more our coding style r=ehsan

MozReview-Commit-ID: AU7HlaOFQm4

--HG--
extra : rebase_source : 685ebaa447dec0c2a47df1a27e3c46d172bc5b61

.clang-format

@@ -28,3 +28,11 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED$"
 
 SortIncludes: false
 
+
+# All of the following items are default
+# in the Mozila coding style from clang format 4.0
+AlwaysBreakAfterReturnType: TopLevel
+BinPackArguments: false
+BinPackParameters: false
+SpaceAfterTemplateKeyword: false
+ReflowComments: false