Ensure rcov includes rubygems and rcov first. 1.8 only

Use this workaround: rspec/rspec-core#370 (comment)

Manifest

@@ -30,6 +30,7 @@ spec/helpers/exec-helper-spec.rb
 spec/helpers/log-helper-spec.rb
 spec/models/appliance-config-spec.rb
 spec/models/config-spec.rb
+spec/rcov_helper.rb
 spec/rspec/ls/one
 spec/rspec/ls/two
 spec/rspec/src/appliances/0.8.x.appl

Rakefile

@@ -39,7 +39,8 @@ end
 def coverage18(t)
   require 'rcov'
   t.rcov = true
-  t.rcov_opts = ['--exclude', 'spec,teamcity/*,/usr/lib/ruby/,.gem/ruby,/boxgrinder-build/,/gems/']
+  rcov_helper =  File.expand_path(File.join(File.dirname(__FILE__), 'spec/rcov_helper.rb'))
+  t.rcov_opts = ["-Ispec:lib #{rcov_helper}", '--exclude', 'spec,teamcity/*,/usr/lib/ruby/,.gem/ruby,/boxgrinder-build/,/gems/']
 end
 
 RSpec::Core::RakeTask.new('spec:coverage') do |t|  

spec/rcov_helper.rb

@@ -0,0 +1,2 @@
+require 'rubygems'
+require 'rspec'