Merge pull request #146 from jparyani/fix-ci

Ensure Cap'n Proto build is always built from HEAD in Dockerfile.dev
Make Sandstorm shell work OK on mobile.
Merge branch 'master' of github.com:sandstorm-io/sandstorm
Update to Meteor 0.9.4.
Missing file from previous commit, apparently.
Fix content-disposition headers being dropped for streams
Merge pull request #147 from jparyani/fix-content-disposition

Fix content-disposition headers being dropped for streams
cat test-suite.log when Cap'n Proto build fails