Exit early in CI for cleaner error logs

Also, in .travis.yml, split `env` into `global` and `matrix` to make it easier to browse between different testing shards.

Author: kdmccormick

.travis.yml

@@ -10,14 +10,18 @@ branches:
  - master
 
 env:
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='lms+discovery+forum'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='lms+registrar'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='ecommerce'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='edx_notes_api'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='credentials'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='analyticspipeline'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='xqueue'
- - DEVSTACK_WORKSPACE=/tmp SHALLOW_CLONE=1 SERVICES='marketing'
+ global:
+ - DEVSTACK_WORKSPACE=/tmp
+ - SHALLOW_CLONE=1
+ matrix:
+ - SERVICES=lms+discovery+forum
+ - SERVICES=lms+registrar
+ - SERVICES=ecommerce
+ - SERVICES=edx_notes_api
+ - SERVICES=credentials
+ - SERVICES=analyticspipeline
+ - SERVICES=xqueue
+ - SERVICES=marketing
 
 services:
  - docker
@@ -34,6 +38,7 @@ before_install:
  - make dev.pull."$SERVICES"
 
 script:
+ - set -e # If one of these commands fails, exit immediately.
  - make dev.provision.services."$SERVICES"
  - make dev.up."$SERVICES"
  - make dev.check."$SERVICES"