Extending indent-error-flow to check for other branch statements

[chavacava]

The rule indent-error-flow checks if the ifblock ends with a return statement. The rule could also check for if blocks ending with branch statements like continue,break, or (ouch!) goto

[I've made the dev and I can make a pull request if you are interested]

Note: the rule is part of the golint-related rules, if the goal is to be isofunctional with golint then instead of extending the rule, a new one can be created.

[mgechev]

Hey @chavacava, yes, introducing a new rule will be great so we can keep the integrity of the inherited rules from golint.