Adding documentation for ansible-galaxy related arguments

website/source/docs/provisioners/ansible.html.md.erb

@@ -96,6 +96,17 @@ Optional Parameters:
       ]
     ```
 
+-   `galaxy_file` (string) - A requirements file which provides a way to
+    install roles with the [ansible-galaxy
+    cli](http://docs.ansible.com/ansible/galaxy.html#the-ansible-galaxy-command-line-tool)
+    on the local machine before executing `ansible-playbook`. By default, this is empty.
+
+-   `galaxy_command` (string) - The command to invoke ansible-galaxy. By
+    default, this is `ansible-galaxy`.
+
+-   `galaxy_force_install` (string) - Force overwriting an existing role.
+    Adds `--force` option to `ansible-galaxy` command. By default, this is empty.
+
 -   `groups` (array of strings) - The groups into which the Ansible host should
     be placed. When unspecified, the host is not associated with any groups.
 
@@ -121,6 +132,11 @@ Optional Parameters:
     `local_port`. A system-chosen port is used when `local_port` is missing or
     empty.
 
+-   `roles_path` (string) - The path to the directory on your local system to
+    install the roles in. Adds `--roles-path /path/to/your/roles` to
+    `ansible-galaxy` command. By default, this is empty, and thus `--roles-path`
+    option is not added to the command.
+
 -   `sftp_command` (string) - The command to run on the machine being
     provisioned by Packer to handle the SFTP protocol that Ansible will use to
     transfer files. The command should read and write on stdin and stdout,