Calling C module in LUA code

Sorry for the delay,

here is a link to the public github repository for the example

Moved the Protobuf example with more documentation here:

https://www.aerospike.com/docs/udf/developing_record_udfs.html#example-using-protobuf

The example for calling C methods from UDF is here:

https://www.aerospike.com/docs/udf/developing_lua_modules.html#using-c-functions-in-udf-modules

This is awesome, thank you!