Allow skipping label fetch

lib/tasks/install.rake

@@ -16,6 +16,8 @@ namespace :redmine do
       puts "             Redmine Backlogs Installer"
       puts "====================================================="
       puts "Installing to the #{ENV['RAILS_ENV']} environment."
+
+      if ! ['no', 'false'].include?("#{ENV['labels']}".downcase)
         print "Fetching card labels from http://git.gnome.org..."
         STDOUT.flush
         begin
@@ -24,6 +26,7 @@ namespace :redmine do
         rescue Exception => fetch_error
           print "\nCard labels could not be fetched (#{fetch_error}). Please try again later. Proceeding anyway...\n"
         end
+      end
 
       trackers = Tracker.find(:all)