replace str2bool with validate_bool
use the proxy to download the plugins

if $jenkins::proxy_host is set then we should use
it to do the wget of the plugins.
puppet will set default mode if nothing is set. Since jenkins needs to write in its home and plugin_dir - mode needs to be set to allow this
Merge pull request #99 from KlavsKlavsen/fixdirperms

set necessary mode on jenkins folders
Merge pull request #97 from roidelapluie/master

use the proxy to download the plugins
Merge pull request #80 from jlambert121/rem_str2bool

replace str2bool with validate_bool
Update the version