features that allows related products to be ordered

RSpec test for update_positions method
Remove support for old Ruby versions from Travis, add Ryan as a notifiee and remove IRC notifications
Dont allow 2.0.0 ruby failure.
Oops accidentally added irc back so remove it.
Remove needless require of rspec/core/rake_task

This is now automatically required by RSpec's railtie code
Use rake spec, not rspec spec
Merge remote-tracking branch 'upstream/master'