Add tagging for ruby tasks, also set PATH so that manual work on

instances is a bit easier.
Also subsumes @sefk's  https://github.com/edx/configuration/pull/42

playbooks/roles/ruby/tasks/main.yml

@@ -3,9 +3,13 @@
 - name: Create 'www' user (replicating historical environment)
   user: name=www state=present
   sudo: True
+  tags:
+  - ruby
 - name: Create ruby base
   sudo: True
   file: path=$ruby_base state=directory owner=www group=www
+  tags:
+  - ruby
 - name: rbenv | install build depends
   sudo: true
   apt: pkg=$item state=present install_recommends=no
@@ -19,66 +23,96 @@
     - libxml2-dev
     - libxslt1-dev
     - zlib1g-dev
+  tags:
+  - ruby
 
 - name: rbenv | update rbenv repo
   sudo: true
   git: repo=git://github.com/sstephenson/rbenv.git dest=$rbenv_root version=v0.4.0
+  tags:
+  - ruby
 
 - name: rbenv | add rbenv to path
   sudo: true
   file: path=/usr/local/bin/rbenv src=${rbenv_root}/bin/rbenv state=link
+  tags:
+  - ruby
 
 - name: rbenv | add rbenv initialization to profile
   sudo: true
   template: src=rbenv.sh.j2 dest=/etc/profile.d/rbenv.sh owner=root group=root mode=0755
+  tags:
+  - ruby
 
 - name: rbenv | check ruby-build installed
   sudo: true
   command: test -x /usr/local/bin/ruby-build
   register: rbuild_present
   ignore_errors: yes
+  tags:
+  - ruby
 
 - name: rbenv | create temporary directory
   command: mktemp -d
   register: tempdir
   when_failed: $rbuild_present
+  tags:
+  - ruby
 
 - name: rbenv | clone ruby-build repo
   git: repo=git://github.com/sstephenson/ruby-build.git dest=${tempdir.stdout}/ruby-build
   when_failed: $rbuild_present
+  tags:
+  - ruby
 
 - name: rbenv | install ruby-build
   sudo: true
   command: ./install.sh chdir=${tempdir.stdout}/ruby-build
   when_failed: $rbuild_present
+  tags:
+  - ruby
 
 - name: rbenv | remove temporary directory
   file: path=${tempdir.stdout} state=absent
   when_failed: $rbuild_present
+  tags:
+  - ruby
 
 - name: rbenv | check ruby $ruby_version installed
   shell: RBENV_ROOT=${rbenv_root} rbenv versions | grep $ruby_version
   register: ruby_installed
   ignore_errors: yes
+  tags:
+  - ruby
 
 - name: rbenv | install ruby $ruby_version
   shell: RBENV_ROOT=${rbenv_root} rbenv install $ruby_version
   sudo: true
   when_failed: $ruby_installed
+  tags:
+  - ruby
 
 - name: rbenv | set global ruby $ruby_version
   shell: RBENV_ROOT=${rbenv_root} rbenv global $ruby_version
   sudo: true
   when_failed: $ruby_installed
+  tags:
+  - ruby
 
 - name: rbenv | rehash
   shell: RBENV_ROOT=${rbenv_root} rbenv rehash
   sudo: true
   when_failed: $ruby_installed
+  tags:
+  - ruby
 
 - name: gem | gem install bundler
   shell: RBENV_ROOT=${rbenv_root} GEM_HOME=${gem_home} ${rbenv_root}/shims/gem install bundle chdir=${app_base_dir}/mitx
   sudo: true
+  tags:
+  - ruby
 
 - name: bundle | bundle install
-  shell: RBENV_ROOT=${rbenv_root} GEM_HOME=${gem_home} ${gem_home}/bin/bundle install --deployment --binstubs chdir=${app_base_dir}/mitx
+  shell: RBENV_ROOT=${rbenv_root} GEM_HOME=${gem_home} ${gem_home}/bin/bundle install --binstubs chdir=${app_base_dir}/mitx
+  tags:
+  - ruby

playbooks/roles/ruby/templates/rbenv.sh.j2

 export RBENV_ROOT="{{ rbenv_root }}"
 export GEM_HOME="{{ gem_home }}"
+export PATH="{{ gem_home }}/bin:$PATH"
 eval "$(rbenv init -)"