fix mmeta version bytes to be 50(Java 6) instead of 51(Java 7)
fix mmeta version bytes to be 50(Java 6) instead of 51(Java 7)

felixvf/mirah-parser,felixvf/mirah-parser,mirah/mirah-parser,mirah/mirah-parser,mirah/mirah,felixvf/mirah,felixvf/mirah,uujava/mirah-parser,mirah/mirah-parser,uujava/mirah-parser,felixvf/mirah,uujava/mirah-parser,felixvf/mirah,felixvf/mirah-parser,mirah/mirah,mirah/mirah,mirah/mirah