Formatting.
Modified validation emphasis style.
Defined validation feedback and messages for simple "required" rule.
Set $dirty status for elfinForm when a keyword is removed from model.
Set $dirty status for elfinForm using setter instead of direct variable
access.
Moved validation helpers from hb-constat-card to hb-card-container
controller for all card directive to inherit from. Improved
hb-card-header layout and feedback.