Lua.g4:operator precedence and associativity
Lua.g4:operator precedence and associativity

I've updated Lua.g4 to include correct operators precedence and associativity.

The format of the associativity tag is the one compliant with Antlr 4.2.2-alpha001
antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4,antlr/grammars-v4