setting HOME to rbenv_dir for bundle install to work

playbooks/roles/rbenv/defaults/main.yml

@@ -3,9 +3,11 @@
 rbenv_version: 'v0.4.0'
 rbenv_bundler_version: '1.3.2'
 rbenv_root: "{{ rbenv_dir }}/.rbenv"
+rbenv_gem_root: "{{ rbenv_root }}/.gem"
+rbenv_gem_bin: "{{ rbenv_gem_root }}/bin"
 rbenv_bin: "{{ rbenv_dir }}/.rbenv/bin"
 rbenv_shims: "{{ rbenv_root }}/shims"
-rbenv_path: "{{ rbenv_bin }}:{{ rbenv_shims }}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+rbenv_path: "{{ rbenv_bin }}:{{ rbenv_shims }}:{{ rbenv_gem_bin }}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 rbenv_debian_pkgs:
   - build-essential
   - git
@@ -18,4 +20,7 @@ rbenv_debian_pkgs:
   - zlib1g-dev
 rbenv_environment:
   RBENV_ROOT: $rbenv_root
+  GEM_ROOT: $rbenv_gem_root
+  GEM_HOME: $rbenv_gem_root
   PATH: $rbenv_path
+  HOME: $rbenv_dir