[PATCH] Add readability-simplify-boolean-expr check to clang-tidy

[Richard]

Prefer explicit declarations over auto when initializing expression doesn't mention the type explicitly.
Prefer `const auto *` declaration when declaring a node type from `getNodeAs<T>`.
Unwrap parenthesis around replacement expression where possible.


http://reviews.llvm.org/D7648

Files:
  clang-tidy/readability/CMakeLists.txt
  clang-tidy/readability/ReadabilityTidyModule.cpp
  clang-tidy/readability/SimplifyBooleanExprCheck.cpp
  clang-tidy/readability/SimplifyBooleanExprCheck.h
  test/clang-tidy/readability-simplify-bool-expr.cpp

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