Fix failing unit test: sproutcore/ajax/en/current/tests/system/request.html

This pr includes the fix for the above unit test (which basically boils down to allowing a longer timeout for the test that was failing: Test Multiple listeners per single status response) and an improvement to the travis-ci script which implements a functionality by which the html of failed tests is pushed to pastebin for post-mortem inspection.

To turn pastebin upload on set the PASTEBIN env var to any not blank value.
Note: there is a limit on the number of pastes that may be created in 24h by the same ip address. Be a good netizen and turn this this functionality on only when enecessary!