Prolong aruba timeout to 60 even on Rubinius.
Disable Rubinius' JIT when running aruba tests.
Merge pull request #287 from razielgn/rbx-changes

 Improve Rubinius support in aruba tests.
Fully embrace _exec over _eval
Merge pull request #290 from cupakromer/move-to-exec

Fully embrace _exec over _eval