.osx: Use plain text smileys in Messages

Messages in OS X 10.9 Mavericks automatically substitutes e.g. `:)` with `😊`, with no way to disable this feature through the app’s preferences pane.

After analyzing the `defaults read` output it turns out there is a hidden preference for it.

.osx

@@ -547,6 +547,13 @@ defaults write com.apple.appstore WebKitDeveloperExtras -bool true
 # Enable Debug Menu in the Mac App Store
 defaults write com.apple.appstore ShowDebugMenu -bool true
 
+###############################################################################
+# Messages                                                                    #
+###############################################################################
+
+# Disable automatic emoji substitution (i.e. use plain text smileys)
+defaults write com.apple.messageshelper.MessageController SOInputLineSettings -dict-add "automaticEmojiSubstitutionEnablediMessage" -bool false
+
 ###############################################################################
 # Google Chrome & Google Chrome Canary                                        #
 ###############################################################################
@@ -621,8 +628,8 @@ defaults write com.twitter.twitter-mac HideInBackground -bool true
 ###############################################################################
 
 for app in "Address Book" "Calendar" "Contacts" "Dashboard" "Dock" "Finder" \
-	"Mail" "Safari" "SizeUp" "SystemUIServer" "Terminal" "Transmission" \
-	"Twitter" "iCal" "iTunes"; do
+	"Mail" "Messages" "Safari" "SizeUp" "SystemUIServer" "Terminal" \
+	"Transmission" "Twitter" "iCal" "iTunes"; do
 	killall "$app" > /dev/null 2>&1
 done
 echo "Done. Note that some of these changes require a logout/restart to take effect."