Add name of project at top of license
fix container_traits with respect to boost::property_tree: Fixes#554
fix as_table with a vector of tuples (forward_get ignored constness): Fixes#552
new sol::filters (currently undocumented)
new gc tests, new plain_type tests
core abstractions over usertypes streamlined
SOL_STRINGS_ARE_NUMBERS triggers added
update single
added variadic_results, to return a variable number of arguments to Lua
added variadic_results and as_results
added improved function examples (for multiple results and split overloading out)
added tests for variadics
added tests for C++17 utilities
added a forwarding header
added a specific `unsafe_function` header
added and improved documetation pages