Implemented clang-tidy-check-specific options.

Summary:
Each check can implement readOptions and storeOptions methods to read
and store custom options. Each check's options are stored in a local namespace
to avoid name collisions and provide some sort of context to the user.

Reviewers: bkramer, klimek

Reviewed By: klimek

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D5296

llvm-svn: 217661

clang-tools-extra/clang-tidy/llvm/TwineLocalCheck.cpp

@@ -17,8 +17,6 @@ using namespace clang::ast_matchers;
 namespace clang {
 namespace tidy {
 
-TwineLocalCheck::TwineLocalCheck() {}
-
 void TwineLocalCheck::registerMatchers(MatchFinder *Finder) {
   auto TwineType =
       qualType(hasDeclaration(recordDecl(hasName("::llvm::Twine"))));