Add Guake role

Fixes #25

roles/gnome-shell/tasks/main.yaml

@@ -26,5 +26,5 @@
 # TODO: Guake toggle - this requires removing a default binding
 # [org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1]
 # binding='<Super>space'
-# command='guake --toggle'
-# name='Guake'
+# command='guake-toggle'
+# name='Guake Toggle'

roles/guake/tasks/main.yaml

@@ -0,0 +1,8 @@
+---
+- assert:
+    that: ansible_os_family != 'Darwin' and ansible_os_family != 'Windows'
+
+- name: install package
+  package:
+    name: guake
+    state: latest