[PATCH] Refactor: Move google clang-tidy checks to namespace clang::tidy::google

[Richard]

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Comment at: clang-tidy/google/AvoidCStyleCastsCheck.cpp:20
@@ -19,3 +19,3 @@
 namespace tidy {
-namespace readability {
+namespace google {
 
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alexfh wrote:
> Please don't remove the "readability" namespace. You can put the "google" namespace around it. Same for other checks.
So you'd prefer `clang::tidy::google::readability`?  I can do that.

http://reviews.llvm.org/D7994

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