pass current_build to build! thread

[jhsu]

some reason the current build is passed as nil to build!, passing current_build fixes this

[cimm]

This fixed the exitstatus problem (as mentioned in issue #58) on my Ubuntu Natty (11.04) machine with Ruby 1.9.2. Thanks!

[Ehabaltahan]

👋 hi

[LilRedClownz]

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