Updated rcov options, added better debug message to base

Rakefile

@@ -30,6 +30,7 @@ Spec::Rake::SpecTask.new(:rcov) do |spec|
   spec.libs << 'lib' << 'spec'
   spec.pattern = 'spec/**/*_spec.rb'
   spec.rcov = true
+  spec.rcov_opts = ['--exclude', 'spec,lib/monster_mash/instance_exec.rb']
 end
 
 task :spec => :check_dependencies

lib/monster_mash/base.rb

@@ -104,7 +104,7 @@ def self.execute(http_method, hydra, block, *args, &setup_block)
       else
         raise MonsterMash::InvalidRequest,
           "Invalid request definition for #{name}:\n" <<
-          request.errors.join('\n\n')
+          request.errors.collect { |e| " * #{e}" }.join("\n")
       end
     end
   end