tests against ruby-head on travis failed

[kalabiyau]

[b4mboo]

@kalabiyau: Would you please try again, now that tests agains Ruby 2.0 are passing?

[xystushi]

Travis failures are usually due to its not being able to find .git_review.yml and thus waiting for user to enter credentials.

In some tests the authentication procedure is not stubbed, but running locally wouldn't lead to any failure because it can usually find the file. That's why it happens often that some tests running fine locally would not pass Travis.

I've patched a few of these cases in #87. It should work now.