Emails: resurrect template notification (#18686)

* Emails: resurrect template notification

* Phantomjs (oh yeah, there is another dev dep phantom :-) was failing for
  the generation of the html templates so I had to update the dependencies
  in order to fix it. While doing that I update the scripts field and docs
  for it as well. yarn.lock is included

* Move splitting of the emails to separate helper function, since more services
  coming up that would need to use this functionality

* Add support for enterprise specific email letters. Probably could
  be done in the better way, but it's not a priority right now

pkg/util/split_email.go

@@ -0,0 +1,14 @@
+package util
+
+import "strings"
+
+// SplitEmails splits addresses with a few different ways
+func SplitEmails(emails string) []string {
+	return strings.FieldsFunc(emails, func(r rune) bool {
+		switch r {
+		case ',', ';', '\n':
+			return true
+		}
+		return false
+	})
+}