Add a proxy command option to SSH commands

Now with more tests! Kinda.

Closes #207

.rspec

@@ -0,0 +1 @@
+--format doc --order random --color --fail-fast

lib/vagrant-aws/action/sync_folders.rb

@@ -86,7 +86,7 @@ def call(env)
               "rsync", "--verbose", "--archive", "-z",
               *excludes.map{|e|['--exclude', e]}.flatten,
               "-e", "ssh -p #{ssh_info[:port]} #{ssh_key_options(ssh_info)} " + 
-              ssh_options.map { |ssh_option| "-o '#{ssh_option}' " }.join,
+              ssh_options_to_args(ssh_options).join(' '),
               hostpath,
               "#{ssh_info[:username]}@#{ssh_info[:host]}:#{guestpath}"]
 
@@ -106,6 +106,18 @@ def call(env)
           end
         end
 
+        # Generate a ssh(1) command line list of options
+        #
+        # @param [Array] options An array of ssh options. E.g.
+        #   `StrictHostKeyChecking=no` see ssh_config(5) for more
+        # @return [Array] Computed list of command line arguments
+        def ssh_options_to_args(options)
+          # Bail early if we get something that is not an array of options
+          return [] unless options
+
+          return options.map { |o| "-o '#{o}'" }
+        end
+
         private
 
         def ssh_key_options(ssh_info)

spec/spec_helper.rb

@@ -0,0 +1 @@
+

spec/vagrant-aws/actions/syncfolders_spec.rb

@@ -0,0 +1,28 @@
+require 'spec_helper'
+require 'vagrant-aws/action/sync_folders'
+
+describe VagrantPlugins::AWS::Action::SyncFolders do
+  let(:app) { nil }
+  let(:env) { {} }
+  subject(:action) { described_class.new(app, env) }
+
+  describe '#ssh_options_to_args' do
+    subject(:args) { action.ssh_options_to_args(options) }
+
+    context 'with no ssh options' do
+      let(:options) { [] }
+
+      it { should eql [] }
+    end
+
+    context 'with one option' do
+      let(:options) { ['StrictHostKeyChecking=no'] }
+      it { should eql ["-o 'StrictHostKeyChecking=no'"] }
+    end
+
+    context 'with multiple options' do
+      let(:options) { ['SHKC=no', 'Port=222'] }
+      it { should eql ["-o 'SHKC=no'", "-o 'Port=222'"] }
+    end
+  end
+end