Make remove_rule(), remove_rules_fields(), and callback() return $this.
Merge pull request #214 from shadlaws/fix_missing_return_this

Make remove_rule(), remove_rules_fields(), and callback() return $this.
Make Formo::get() and Formo::set() work with paths in '_vars' variable.
Merge pull request #215 from shadlaws/fix_get_set_paths_vars

Make Formo::get() and Formo::set() work with paths in '_vars' variable.
Add locally-defined error message support ($this->set('error_messages', $array))
Merge pull request #213 from dfox288/issue-206

Recursive name generation. Fixes #206
Merge pull request #217 from shadlaws/locally_defined_error_messages

Add locally-defined error message support ($this->set('error_messages', $array))
Add Formo::set_var_fields() to set one variable for multiple fields.
Merge pull request #216 from shadlaws/set_single_variable_multiple_fields

Add Formo::set_var_fields() to set one variable for multiple fields.
Merge remote-tracking branch 'upstream/master'