Adding plusone plugin

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+[[!template id=plugin name=tracking author="[[BerndZeimetz]]"]]
+[[!toc]]
+[[!tag plugins]] [[!tag patch]] [[!tag wishlist]]
+
+## NAME
+
+IkiWiki::Plugin::plusone - Adding the +1 button to your posts
+
+## SYNOPSIS
+
+    # activate the plugin
+    add_plugins => [qw{goodstuff plusone ....}],
+
+    # set some options:
+    plusone_count => 1,
+    plusone_size => 'standard',
+    plusone_lang => 'en-US',
+
+   
+## DESCRIPTION
+
+This plugin allows to add a google plusone button using the plusone directive
+  [[!plusone ]]
+where ever you want the button to show up.
+Please note that you need to either use my modified htmlscrubber plugin to allow the google plusone tags within your site's content - or disable htmlscrubber completely (not recommended!).
+
+## DOWNLOAD
+
+* single files: [plusone.pm](http://git.recluse.de/?p=users/bzed/ikiwiki.git;a=blob_plain;f=IkiWiki/Plugin/plusone.pm;hb=refs/heads/plusone) [htmlscrubber.pm](http://git.recluse.de/?p=users/bzed/ikiwiki.git;a=blob_plain;f=IkiWiki/Plugin/htmlscrubber.pm;h=5193d02487694c0bab902f2ca84a0a55b6745754;hb=refs/heads/plusone)
+* browse repository: <http://git.recluse.de/?p=users/bzed/ikiwiki.git;a=shortlog;h=refs/heads/plusone>
+* git repo: `git://git.recluse.de/users/bzed/ikiwiki.git` or <http://git.recluse.de/repos/users/bzed/ikiwiki.git> (Use the plusone branch)