Travis Not running Browser tests

Hi, of the 12 jobs running upon every Pull-request commit, none of the browser specific tests run!

Only the unit-test runs.

For example on #18, the tests ran, but only [travis build 26.1]() actually ran the test suite.

The others (browser based) had the following line in the output:

```
Not running any tests
```

which you can see for instance in [travis build 26.2](https://travis-ci.org/corejavascript/typeahead.js/jobs/85697833) and all the others in the [travis build list]() for #18.

The line in `test/ci` https://github.com/corejavascript/typeahead.js/blob/master/test/ci#L5

``` bash
elif [ "$TRAVIS_SECURE_ENV_VARS" == "true" -a "$TEST_SUITE" == "integration" ]; then
```

evaluates to

``` bash
+'[' false == true -a integration == integration ']'
```

which must mean that `"$TRAVIS_SECURE_ENV_VARS"` is not set.

Who can help setting up the browser tests again?? I'd like to help but am in doubt about who has access to setting it up?