(re-)hide rspec task when rspect is not available.

tasks/spec.rake

@@ -1,10 +1,10 @@
-#begin
+begin
   require 'rspec/core/rake_task'
   desc 'Run RSpecs to confirm that all functionality is working as expected'
   RSpec::Core::RakeTask.new('spec') do |t|
     t.rspec_opts = ['--colour', '--format nested']
     t.pattern = 'spec/**/*_spec.rb'
   end
-#rescue LoadError
-#  puts "Hiding spec tasks because RSpec is not available"
-#end
+rescue LoadError
+  puts "Hiding spec tasks because RSpec is not available"
+end