Add CI to the WebUI

[kelsos]

There is a number of component tests currently for the WebUI but the suite is only run manually. It would be better to have the tests and lint tasks run automatically on a CI server.

First step

• [x] Add CI for jasmine/component tests
• [x] Add lint checking on CI

Second step

• [x] Create a release flow that has automatic artifact uploading through github (#22)

Future

• [ ] Add e2e integration tests with Raiden