Remove explicit bootstrapping from Travis config

Forgot that script/cibuild does this already.
Disable Travis' email notificatoins
Merge branch 'master' into unit-tests
Basic tests for GCYGroceryStore
Update jspahrsummers/objc-build-scripts to the latest

Conflicts:
	script/cibuild
Add build status badge
Set up UserSettings.xcconfig in before_script step
Merge pull request #13 from jspahrsummers/fix-travis

Set up Travis CI
Merge remote-tracking branch 'origin/master' into unit-tests