expose getAvatarUrlFromUsername function to server side

packages/rocketchat-ui/lib/avatar.coffee

-@getAvatarUrlFromUsername = (username) ->
-	key = "avatar_random_#{username}"
-	random = Session.keys[key] or 0
-	if not username?
-		return
-
-	if Meteor.isCordova
-		path = Meteor.absoluteUrl()
-	else
-		path = '/'
-	"#{path}avatar/#{encodeURIComponent(username)}.jpg?_dc=#{random}"
-
 Blaze.registerHelper 'avatarUrlFromUsername', getAvatarUrlFromUsername
 
 @getAvatarAsPng = (username, cb) ->

packages/rocketchat-ui/lib/getAvatarUrlFromUsername.coffee

+@getAvatarUrlFromUsername = (username) ->
+	key = "avatar_random_#{username}"
+	random = Session?.keys[key] or 0
+	if not username?
+		return
+
+	if Meteor.isCordova
+		path = Meteor.absoluteUrl()
+	else
+		path = '/'
+	"#{path}avatar/#{encodeURIComponent(username)}.jpg?_dc=#{random}"

packages/rocketchat-ui/package.js

@@ -32,6 +32,7 @@ Package.onUse(function(api) {
 	api.use('kadira:flow-router', 'client');
 
 	// LIB FILES
+	api.addFiles('lib/getAvatarUrlFromUsername.coffee');
 	api.addFiles('lib/accountBox.coffee', 'client');
 	api.addFiles('lib/accounts.coffee', 'client');
 	api.addFiles('lib/avatar.coffee', 'client');