Lutorpy

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* fix Lua stack leak during table iteration

* fix lost Lua object reference after iteration

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* error reporting on Lua syntax errors failed to clean up the stack so
that errors could leak into the next Lua run

* Lua error messages were not properly decoded

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* much faster locking of the LuaRuntime, especially in the single
threaded case (see
http://code.activestate.com/recipes/577336-fast-re-entrant-optimistic-lock-implemented-in-cyt/)

* fixed several error handling problems when executing Python code
inside of Lua

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* fixed Python special double-underscore method access on LuaObject
instances

* Lua coroutine support through dedicated wrapper classes, including
Python iteration support. In Python space, Lua coroutines behave
exactly like Python generators.

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* support for returning multiple values from Lua evaluation

* ``repr()`` support for Lua objects

* ``LuaRuntime.table()`` method for creating Lua tables from Python
space

* encoding fix for ``str(LuaObject)``

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* ``LuaRuntime.require()`` and ``LuaRuntime.globals()`` methods

* renamed ``LuaRuntime.run()`` to ``LuaRuntime.execute()``

* support for ``len()``, ``setattr()`` and subscripting of Lua objects

* provide all built-in Lua libraries in ``LuaRuntime``, including
support for library loading

* fixed a thread locking issue

* fix passing Lua objects back into the runtime from Python space