Updated notifier documentation.

1) Added missing notifiers to general notifier page and rearranged
notifiers to be in alphabetical order.
2) Added documentation about new name property for notifiers and how it
works into the service call.

source/components/notify.markdown

@@ -13,13 +13,15 @@ One of the things most people want at some point in their home automation is to
 
 Home Assistant currently supports a wide range of services for notifications:
 
+- [E-Mail](/components/notify.smtp.html)
+- [File](/components/notify.file.html)
 - [Instapush](/components/notify.instapush.html)
+- [Jabber (XMPP)](/components/notify.xmpp.html)
 - [Notify My Android (NMA)](/components/notify.nma.html)
 - [PushBullet](/components/notify.pushbullet.html)
 - [PushOver](/components/notify.pushover.html)
-- [E-Mail](/components/notify.smtp.html)
+- [Slack](/components/notify.slack.html)
 - [Syslog](/components/notify.syslog.html)
-- [Jabber (XMPP)](/components/notify.xmpp.html)
 
 ### Automation example
 
@@ -34,7 +36,7 @@ automation:
   state_from: above_horizon
   state_to: below_horizon
 
-  execute_service: notify.notify
+  execute_service: notify.NOTIFIER_NAME
   service_data: {"message":"YAY"}
 ```