(FACT-569) Run acceptance against Windows ruby 2.0 x64

This depends on #728 to be pulled first.

 * (maint) ignore .idea folder
 * (maint) Update gemfile to pin beaker and rake
 * (maint) Add acceptance/.gitignore to ignore beaker created folders
 * (maint) timesync should no longer be required
 * (maint) use `~/.ssh/id_rsa-acceptance` by default (note that this is overridden on spec boxes)
 * (maint) preserve hosts on fail
 * (maint) clean up node configs
 * (FACT-569) Switch ruby based on node config's host ruby_arch setting
 * (FACT-569) Add/update Windows node configs