Fixed check for rvm

roles/developer-machine/tasks/main.yml

@@ -2,18 +2,16 @@
 # This playbook contains plays that will run on developer-machines
 
 - name: Is rvm installed
-  shell: which rvm
-  become: yes
-  become_user: cody
+  stat: path=/usr/local/rvm/bin/rvm
   register: rvm_installed
-  failed_when: "rvm_installed.rc == 2 or rvm_installed.rc == 3"
 
 - name: Install rvm key
   shell: gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
-  when: rvm_installed.stdout == ""
+  when: not rvm_installed.stat.exists
+
 - name: Install rvm and latest ruby
   shell: \curl -sSL https://get.rvm.io | bash -s stable
-  when: rvm_installed.stdout == ""
+  when: not rvm_installed.stat.exists
 
 - name: Is heroku installed
   shell: which heroku