Updated `enb-bem-docs` to `0.4.0`
Merge pull request #977 from bem/issues/976@v2

Updated `enb-bem-docs` to `0.4.0`
(radio|checkbox)_type_button: won't work in IE9 (close #975)
Merge pull request #978 from bem/issues/975@v2

(radio|checkbox)_type_button: won't work in IE9 (close #975)
fix type check
Porting changes from islands-components/spin2