Merge pull request #4 from strika/master

Spring support
Merge pull request #5 from strika/master

Fix Spring support
Remove --drb when running cucumber
Merge pull request #7 from renderedtext/remove-spork-support

Remove --drb when running cucumber
Revert "Check if .zeus.sock exists with filereadable()"

This reverts commit 84b8d82f6c439bff10826e9ae1c67968e0f2b5f0, because it
doesn't work.
Support globally installed Spring
Remove --drb option for RSpec