chore(travis): use xvfb, always test downstream, test docgen

Author: christopherthielen

.travis.yml

@@ -1,28 +1,16 @@
 language: node_js
 node_js: 8.9.1
-before_install: yarn global add greenkeeper-lockfile@1 yalc
-install: yarn --check-files
-before_script: greenkeeper-lockfile-update && greenkeeper-lockfile-upload
+before_install: sh -e /etc/init.d/xvfb start
 script:
-- if [ "x${CORE_BRANCH}x" != "xx" ] ; then ./node_modules/.bin/publish_yalc_package
-  .downstream_cache/core https://github.com/ui-router/core.git && yalc add @uirouter/core
-  ; fi
-- if [ "x${DOWNSTREAM_PKGS}${DOWNSTREAM}x" != "xx" ] ; then npm run test:downstream
-  ; else tsc && npm test ; fi
+- if [ "x${CORE_BRANCH}x" != "xx" ]; then npx publish_yalc_package .downstream_cache/core https://github.com/ui-router/core.git && yalc add @uirouter/core && export UPSTREAM_PKGS=@uirouter/core; fi
+- tsc
+- yarn test
+- npx generate_docs
+- yarn test:downstream
 env:
-  global:
-    secure: TanWbkSRljYf0ENPiF3LDM+6RDYyUZoVIIQjUk9UDZ1MBvzEiqISB/zKSXSoYY1JNZpNcXgje2Sl08yGhAugRVodH+FJa/khSkXwRsZAlJuG8qPFAevW4gffvJvPAE7O0uy4jLyyu+Fi9dptdi1zDGsOps/Q+WURH9jWPGmQpj8=
   matrix:
   - CORE_BRANCH=
   - CORE_BRANCH=master
-  - CORE_BRANCH=master UPSTREAM_PKGS=@uirouter/core DOWNSTREAM=true
-  - DOWNSTREAM=true
-matrix:
-  fast_finish: true
-  allow_failures:
-  - env: CORE_BRANCH=
-  - env: DOWNSTREAM=true
-  - env: CORE_BRANCH=master UPSTREAM_PKGS=@uirouter/core DOWNSTREAM=true
 notifications:
   slack:
     on_success: never