add readme file for edx-west, prod-log playbook

While in here do a couple of cleanups:

- remove a log file
- add a simple playbook for refreshing roles on the prod log machine

playbooks/edx-west/README.md

+This doc is a useful place to keep commands in a handy place.  Keep
+in mind that this is a public repo so we shouldn't store anything
+confidential in here.
+
+Other install docs:
+
+- Giulio's install doc [here][1].
+
+  [1]: https://docs.google.com/document/d/1ZDx51Jxa-zffyeKvHmTp_tIskLW9D9NRg9NytPTbnrA/edit#heading=h.iggugvghbcpf
+
+
+Ansible Commands - Prod
+-----------------------
+
+Generally we do installs as the "ubuntu" user.  You want to make
+sure that the stanford-deploy-20130415 ssh key is in your ssh agent.
+
+    ANSIBLE_EC2_INI=ec2.ini ansible-playbook prod-log.yml -u ubuntu -c ssh -i ./ec2.py
+
+
+Ansible Commands - Stage
+------------------------
+
+Verify that you're doing something reasonable:
+
+    ANSIBLE_CONFIG=stage-ansible.cfg ANSIBLE_EC2_INI=ec2.ini ansible-playbook stage-app.yml -u ubuntu -c ssh -i ./ec2.py --list-hosts
+
+Verify that you're doing something reasonable:
+
+    ANSIBLE_CONFIG=stage-ansible.cfg ANSIBLE_EC2_INI=ec2.ini ansible-playbook stage-app.yml -u ubuntu -c ssh -i ./ec2.py
+
+
+

playbooks/edx-west/prod-log.yml

+- hosts: tag_Name_log10_prod
+  sudo: True
+  vars_files:
+    - "{{ secure_dir }}/vars/users.yml"
+  vars:
+    secure_dir: '../../../configuration-secure/ansible'
+    local_dir:  '../../../configuration-secure/ansible/local'
+  roles:
+    - common