Merge pull request #19 from pivotal-beach/master

Update installation instructions, etc.
Merge pull request #20 from pivotal-beach/master

Configure Travis-CI
Merge pull request #21 from pivotal-beach/master

Configure Travis-CI
Merge pull request #22 from pivotal-beach/master

Exclude ipa signer spec from Travis
Merge branch 'master' of https://github.com/pivotal-beach/thrust