[PATCH] clang-format: Implement AlwaysBreakAfterDeclarationReturnType.

[strager]

Rebase. Refactor option to be a ReturnTypeBreakingStyle,
similar to AlwaysBreakAfterDefinitionReturnType.


http://reviews.llvm.org/D10370

Files:
  docs/ClangFormatStyleOptions.rst
  include/clang/Format/Format.h
  lib/Format/ContinuationIndenter.cpp
  lib/Format/Format.cpp
  lib/Format/TokenAnnotator.cpp
  unittests/Format/FormatTest.cpp

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