Update generator and Gemspec to match modified register method

lib/generators/open_project/plugin/templates/%full_name%.gemspec.tt

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.authors     = "Finn GmbH"
   s.email       = "info@finn.de"
   s.homepage    = "https://www.openproject.org/projects/<%= plugin_name.gsub('_','-') %>"  # TODO check this URL
-  s.summary     = FIXME
+  s.summary     = 'OpenProject <%= plugin_name.gsub('_', ' ').titleize %>'
   s.description = FIXME
   s.license     = FIXME # e.g. "MIT" or "GPLv3"
 

lib/generators/open_project/plugin/templates/lib/open_project/%plugin_name%/engine.rb.tt

@@ -4,8 +4,7 @@ module OpenProject::<%= plugin_name.camelcase %>
 
     include OpenProject::Plugins::ActsAsOpEngine
 
-    register 'OpenProject <%= plugin_name.gsub('_', ' ').titleize %>',
-             '<%= full_name %>',
+    register '<%= full_name %>',
              :author_url => 'http://finn.de',
              :requires_openproject => '>= 3.0.0pre13'