Small cleanup for the spec_helper file and jruby support

[seuros]

No description provided.

[seuros]

I added jruby to travis matrix.

Concurrency test are excluded since they are failing in jruby. I think we should use barrier .

PS: can we turn on the rbx tests again ?

[mceachen]

Wow, dude, this was a lot of work. Thanks!

[seuros]

I didn't finish. I want to rewrite the parallel tests but i still need to understand the current ones.

[mceachen]

I turned on the rbx tests, but disabled all the head versions, as the travis build was taking hours for each run. We can uncomment them occasionally just to check.

[mceachen]

I had to allow_failures for jruby and rbx. If you have time to look into why they're failing, that'd be great, but I want to fix the sort_order bugs first.

Thanks again for all your help, sir. Much appreciated!

[seuros]

@mceachen , the change log don't make reference to the feature and the rspec matcher i added.

[mceachen]

Darn. I'll restore it.

Matthew