Updated docs and variadic templates support
Fix preprocessor code that detects variadic templates usabilty
Refs #9479 (polymorphic_get for Boost.Variant)
Do not use variadic templates on MSVC2013 + add some tests to make sure that Spirit metaprogramming code works well with macro from Variant
Allow rvalue-preformance-tests compilation in C++03 mode. This may be useful to measure performance of copy constructors/operators in C++03
Merge branch 'develop'