improve exception documentation
improve state_view default handlers
add SAFE_PROPAGATION defines for compiling C++ as Lua
add examples for automatic operator registrations and as_container
fix tutorial code
change tests to not throw unless absolutely necessary
provide synchronization for file writing in tests
provide thread safety around thread tests for REQUIRE
add ostream automatic support
change 5.1 compat to only kick in luaL_loadbufferx and luaL_loadfilex when LuaJIT is version 2.0.1 and lower
Slight breaking change, but at the source level almost nothing changes (ipairs is the only thing that changes because for some reason it checks if what is passed is a table and that really doesn't make any fucking sense)
Closes#195Closes#196
