Use Travis to run test with Selenium Grid

[aaltat]

Consider writing a test which always uses a Selenium Grid.

Make also Travis run the test.

[aaltat]

When using Selenium Grid it adds logging in the keywords. Example like this:

Starting new HTTP connection (1): 10.0.2.15:4444

This causes few acceptance tests for fail, because test assume that certain logging happens in certain row. Need to think how that could be fixed.

[aaltat]

One idea could be that we would rerun some tests, in Travis, by using Grid.

1. Download selenium-server-standalone-.jar
2. Setup the hub and node
3. Enhance the atest/run.py so that running test is easy with Travis by using grid.

[aaltat]

Resolved the logging problem by adding a "NoGrid" tag to tests and skipping those test when running with Selenium grid.