c++11 status: Replace references to "SVN" with "3.1" to avoid confusion when they diverge.
c++11 status: Replace references to "SVN" with "3.1" to avoid confusion when they diverge.

Color is still yellow, as 3.1 isn't released yet.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@155217 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang