Fix infinite loop on bad regexp syntax plus normalize a little closer to MRI ripper impl
Un-exclude test
Fix regression in #1075.

Fiber started to get GCed and shut down, but then woke up and
tried to yield. If a fiber yielding control has its own queue
shut down, allow exception to propagate normally.
Merge remote-tracking branch 'origin/jruby-1_7'

Conflicts:
	test/externals/ruby1.9/excludes/TestRipper/ParserEvents.rb