Avoid having "using namespace" for both "clang" and "llvm" namespaces.
This is fragile, as there are classes with the same name in both
namespaces (e.g. llvm::Module and clang::Module).


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@219855 91177308-0d34-0410-b5e6-96231b3b80d8
[clang-tidy] Default options in modules.

Summary:
This patch allows modules to specify default options for the checks
defined in them. This way a sufficiently configurable check can be registered in
multiple modules with different default options. E.g. the SpacesBeforeComments
option may be set to 1 for the "llvm-namespace-comments" check and to 2 for the
"google-readability-namespace-comment" check without modifying or extending the
check code.

This patch also registers the google-readability-braces-around-statements check
with suitable defaults.

Reviewers: djasper

Reviewed By: djasper

Subscribers: curdeius, cfe-commits

Differential Revision: http://reviews.llvm.org/D5798

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@219923 91177308-0d34-0410-b5e6-96231b3b80d8
[clang-tidy] Minor fixes for the NamespaceCommentCheck.

  * Make SmallVector size enough for all groups.
  * Allow trailing period in the comment.
  * Fix "// anonymous namespace qqq".



git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@219926 91177308-0d34-0410-b5e6-96231b3b80d8