Added lua scripts to project that are used as examples for demonstrating two different lua threads, each with their own lua environment and running the SAME script, but different files, each creating the same two lua variables 'width' and 'height' but with different values for each between the two threads.  The main program then executes these scripts in their respective threads and each thread's lua environment is queried for those two variables' values and printed to console to demonstrate concurrent multi-threaded lua script execution using multiple instances of the LuaThread outer wrapper class.  Also, added 'main_console.log' file to the project that contains sample console output messages confirming proper operation of thread creation, execution, sleeping, main() thread querying lua variables in each thread and displaying that they are different, confirming two separate concurrent lua environments.