Merge remote-tracking branch 'origin/develop' into sol3

# Conflicts:
#	include/single/sol/sol.hpp
#	include/single/sol/sol_forward.hpp

docs/source/api/usertype.rst

@@ -92,7 +92,7 @@ If you don't specify any constructor options at all and the type is `default_con
 	- If you pass the ``constructors<...>`` argument first when constructing the usertype, then it will automatically be given a ``"{name}"`` of ``"new"``
 * ``"{name}", sol::initializers( func1, func2, ... )``
 	- Used to handle *initializer functions* that need to initialize the memory itself (but not actually allocate the memory, since that comes as a userdata block from Lua)
-	- Given one or more functions, provides an overloaded Lua function for creating a the specified type
+	- Given one or more functions, provides an overloaded Lua function for creating the specified type
 		+ The function must have the argument signature ``func( T*, Arguments... )`` or ``func( T&, Arguments... )``, where the pointer or reference will point to a place of allocated memory that has an uninitialized ``T``. Note that Lua controls the memory, so performing a ``new`` and setting it to the ``T*`` or ``T&`` is a bad idea: instead, use ``placement new`` to invoke a constructor, or deal with the memory exactly as you see fit
 * ``{anything}, sol::factories( func1, func2, ... )``
 	- Used to indicate that a factory function (e.g., something that produces a ``std::unique_ptr<T, ...>``, ``std::shared_ptr<T>``, ``T``, or similar) will be creating the object type

include/sol/load_result.hpp

@@ -122,7 +122,7 @@ namespace sol {
 
 		template <typename... Ret, typename... Args>
 		decltype(auto) call(Args&&... args) {
-#if defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 191200000
+#if !defined(__clang__) && defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 191200000
 			// MSVC is ass sometimes
 			return get<protected_function>().call<Ret...>(std::forward<Args>(args)...);
 #else

include/sol/proxy.hpp

@@ -126,7 +126,7 @@ namespace sol {
 
 		template <typename... Ret, typename... Args>
 		decltype(auto) call(Args&&... args) {
-#if defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 191200000
+#if !defined(__clang__) && defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 191200000
 			// MSVC is ass sometimes
 			return get<function>().call<Ret...>(std::forward<Args>(args)...);
 #else