Ability to run integration tests locally

[jesperronn]

I have problems getting saucelabs to run our test suite (it was added by @jharding in twitter/typeahead.js project back in 2014, but broke at some point in time).

Now, some of the problem is covered by #20 and #21. But actually being able to run the integration tests locally would help so that we can see and debug errors with the actual suite.

The file integration/test.js is the actual test, but also sets up Saucelabs-specific variables.

The task will be to make a split, so that we can run a simple task locally (which probably could use Phantom).

For example:

npm run test:integration

[sheeley]

@jesperronn have you done any work on this? Want me to take a look?

[jesperronn]

@sheeley to be honest, no. I haven't looked into it since. Running the tests will be a big plus for the project, so I encourage you (and anybody else) to look into it. And make a fix.

[colinrotherham]

@jesperronn @sheeley I've updated dependencies and got the tests running again here (couple of Promise-based tests needed updating, mainly PhantomJS etc).

It's on this pull request: #104
(via this commit: 9c6e693)