fix attr-value-double-quotes: without quotes should not result in an error
back to last version of rule attr-value-double-quotes
add rule: src-not-empty-string
change ruleid from src-not-empty-string to src-not-empty
fix rule: attr-value-double-quotes
add src-not-empty to default rule
Disable rule at false value
Add formatters
Merge branch 'formatters'
update htmlhint