Replaced return nodes with jmp nodes in hardcoded if test
First attempt at integrating if into visitors
Adapted hardcoded if example to match foo.mj
Merge commit '370eed05eff9d117f88d0e7fe655053660381bb1' into if_success!!!☃❅
Optimized code for visiting then/else statements
Removed some countVariableDeclarations stuff. "30 succeeded"
Merge branch 'if_success!!!☃❅' into firm