Fix JsonProfilePrinter

[dmarcotte]

first flag was incorrectly set, resulting in a leading comma for json profile output.

Also remove some calls to rspec's have, which has been removed from rspec since the profiler specs were last run.

@headius, with this the spec/profiler specs are green for 1.7. Do you want to re-enable on Travis?

[headius]

Great to hear you got them all working! Yes, we will reenable on travis. Add that to PR and we'll pull it in.

[dmarcotte]

Ready to go! Specs are enabled and verified (also fixed a problem where it was messing with rake's final outcome in spite of all passing tests).

Note: I only flipped the switch for 1.9 since it turns out there's still one failure for 1.8:

1) JRuby's profiling mode reports unimplemneted methods like fork as unimplemented
     Failure/Error: Kernel.respond_to?(:fork).should == false
       expected: false
            got: true (using ==)
     # ./spec/profiler/profiler_basics_spec.rb:8:in `(root)'

Let me know if there's a strong desire to see 1.8 profile specs running in Travis and I'll try and send a follow-up pull addressing this.

[dmarcotte]

@headius just noticed this guy was unmerged... just slipped off your radar too? (No worries if that's the case!) Or is there something we want to address here?

Also: I just rebased to the latest jruby-1_7, so Travis should soon (hopefully...) confirm everything is still cool here.