Add test for 'input' block

Update test
Merge pull request #605 from eGavr/v2

Add test for 'input' block
Fix icon template
Merge pull request #631 from bem/issues/#628@v2

Fix icon template
radio-group: add specs
Merge pull request #604 from bem/radio_group_edit_test

radio-group: Check coverage tests
radio: Check coverage tests