Run Zulip tests automatically using Travis CI.

This is a bit hackish in that ideally we'd use proper options parsing
in provision.py, but it works and I even ran the tests 100x for tests
for flakes and didn't get any, so it's definitely an improvement!

With this we'll be both testing the runtime and effectively the Dev VM
setup process, which is awesome; the additional thing I'd want to add
tests for is the production setup process...

.travis.yml

@@ -0,0 +1,15 @@
+install:
+  - pip install pbs
+  - python provision.py --travis
+cache: apt
+language: python
+python:
+  - "2.7"
+# command to run tests
+script:
+  - source /srv/zulip-venv/bin/activate && env PATH=$PATH:/srv/zulip-venv/bin ./tools/test-all
+sudo: required
+services:
+- docker
+addons:
+  postgresql: "9.3"

provision.py

@@ -51,6 +51,10 @@ NPM_DEPENDENCIES = {
 VENV_PATH="/srv/zulip-venv"
 ZULIP_PATH="/srv/zulip"
 
+# TODO: Parse arguments properly
+if sys.argv[1] == "--travis":
+    ZULIP_PATH="."
+
 # tsearch-extras is an extension to postgres's built-in full-text search.
 # TODO: use a real APT repository
 TSEARCH_URL_BASE = "https://dl.dropboxusercontent.com/u/283158365/zuliposs/"
@@ -159,6 +163,10 @@ def main():
     os.system("tools/download-zxcvbn")
     os.system("tools/emoji_dump/build_emoji")
     os.system("generate_secrets.py -d")
+    if sys.argv[1] == "--travis":
+        os.system("sudo service rabbitmq-server restart")
+        os.system("sudo service redis-server restart")
+        os.system("sudo service memcached restart")
     sh.configure_rabbitmq(**LOUD)
     sh.postgres_init_db(**LOUD)
     sh.do_destroy_rebuild_database(**LOUD)