Make the tests easier to run cold.
Atmosphere.disconnect() method was added - it synchronously closes existing DDP connection, if any
bin/mrt.js: process.exit() was replaced by Atmosphere.disconnect()
Exit with an error code when breaking.

For #227
Explain about `/usr/local/bin/git`
include explicit steps to get tests up and running
Merge pull request #232 from oortcloud/contrib-test-docs

include explicit steps to get tests up and running
improve error reporting and use rolling timeout
235 - revert to known good wrench version.  tests fail with latest
Merge pull request #236 from oortcloud/235_wrench_version

235 - revert to known good wrench version.  tests fail with latest
Merge branch 'master' into rolling-timeout
support '--progress' flag to git clone command
ignore swp files
retry rmdir a few times
Merge pull request #237 from oortcloud/235b-retry-rmdir

retry rmdir a few times
fix params to clone spawn call
Merge branch 'master' into rolling-timeout
Merge pull request #233 from oortcloud/rolling-timeout

improve error reporting and use rolling timeout