Pre v3.0.4 (no comments) confusion patch

Enable \ disable of both the "assign to" dropdown and the "Add"(comment)
button calling the js function onkeyup of the comment textarea
v3.0.4 KOfied solution & email ack for assign to user comment

KO binding for "enable" mode of assign to ddl & add btn (changes in vm,
view, .. because now commentToAdd is an observable of observable).
Change contact email & script refresh.