Clean up EtherPad dep install

roles/etherpad/tasks/main.yml

@@ -10,16 +10,32 @@
   git:
     repo: https://github.com/ether/etherpad-lite.git
     dest: /var/local/etherpad/etherpad-lite
-    version: master
+    version: 1.7.5
   become: true
   become_user: etherpad
 
-# Installation script
-# TODO: move this in a handler
+# Installation script bin/installDeps.sh (1)
+- name: Create node_modules directory
+  file:
+    path: /var/local/etherpad/etherpad-lite/node_modules
+    state: directory
+  become: true
+  become_user: etherpad
+
+# Installation script bin/installDeps.sh (2)
+- name: Create symbolic link to EtherPad src
+  file:
+   src: /var/local/etherpad/etherpad-lite/src
+   dest: /var/local/etherpad/etherpad-lite/node_modules/ep_etherpad-lite
+   state: link
+  become: true
+  become_user: etherpad
+
+# Installation script bin/installDeps.sh (3)
+# TODO --no-save
 - name: Install Etherpad dependencies
-  command: bin/installDeps.sh
-  args:
-    chdir: /var/local/etherpad/etherpad-lite
+  npm:
+    path: /var/local/etherpad/etherpad-lite/node_modules/ep_etherpad-lite
   become: true
   become_user: etherpad