Stylesheet path updated.

When I had downloaded this plugin to use, github appended "-master" to the end of the folder name. When I installed the plugin, none of the styles were working because the view template was pointing to "zoneboard/css/" instead of my version of "zoneboard-master/css/." I have updated the context sent to the view to contain the full URL to the CSS file, independent of whatever the plugin folder is called. This also makes the plugin easier to include inside of other plugins. I have also changed the name of the context variable for semantics. Hope it helps! :)