Fix booleans comparaison issue125

[philalex]

Do case insensitive comparaison for booleans.
Code could be rewritten like:

value := strings.ToLower(flagVal)
if value != "false" && value != "true" {
          value = flagVal
}
result = value == t.Compare.Value

But i don't like this style ...

[ttousai]

Thanks @philalex

LGTM