[meta] Add tasks for fixing up the Dock

ansible/roles/osx/tasks/dock.yml

@@ -0,0 +1,7 @@
+---
+- homebrew: name=dockutil state=present
+- command: dockutil --remove all
+- command: dockutil --add ~/Downloads --view list
+                                      --display stack
+                                      --sort datemodified
+- homebrew: name=dockutil state=absent

ansible/roles/osx/tasks/main.yml

@@ -1,6 +1,7 @@
 ---
 - homebrew: update_homebrew=yes
 - include: formulae.yml
+- include: dock.yml
 - include: casks.yml
 - include: fonts.yml
 - include: defaults.yml