This commit boosts the version of Guard that is required to at least 2.0 since that was the version that introduced `Guard::Plugin`. This also adjusts the syntax in the specs to be compatible with rspec 2 instead of only working with rspec 3.
The `Guard::Resque` plugin was inheriting from `Guard::Guard` which was deprecated and then later removed in guard version 2.9.0. This commit adjusts the plugin to inherit from `Guard::Plugin` to allow it to work with versions of guard after 2.9.0.
This includes adding the :vverbose option to provide access to the standard VERBOSE resque option, instead of all-or-nothing.
… available options, add tests