add check for return type, check main is void no args
prevent main from being called
Merge branch 'master' of https://github.com/albertcui/gawk into features
print hello world
Merge branch 'master' of https://github.com/albertcui/gawk into features
added code_gen to make clean
Merge branch 'master' of https://github.com/albertcui/gawk into features
fixed variable & array initialization in code_gen
Merge branch 'master' of https://github.com/albertcui/gawk into features
Merge branch 'features' of https://github.com/albertcui/gawk into features
pulled in master changes