Minor refactoring for the Lua bindings

added header files for classes Lua[TLSF]Component and Lua[TLSF]Service
added member function getLuaState() and class LuaStateHandle to access the Lua state from outside with proper locking
split rttlua-* executable implementation into a separate source file rttlua.cpp. The binaries link to the respective component library.
fixed missing lua_pop calls in the call_func() helper function after an error (f600c19)

The patch allows users to inherit from OCL::LuaComponent or OCL::LuaService to build customized Lua-enabled component and service plugins. This is particularly interesting to add operations and either implement them in C++ or forward them to a Lua implementation using the new LuaStateHandle class. It is currently not possible to implement operations in pure Lua.

orocos-toolchain / ocl

Minor refactoring for the Lua bindings #46