Validate Selenium availability on the drupalbox

[becw]

See also https://github.com/massgov/mass/pull/96/files

[froboy]

@becw could you please help me understand why this was closed? I can't find that selenium is actually available on the box.

My journey:

Luke directed me to https://github.com/massgov/mass/pull/96/files#diff-000c08c03fb7e7ea1a1b1dd5c6a1ce4e but I can't tell where that's actually installing selenium in the box... @becw opened and then closed #25 but it doesn't look like the issue was resolved. https://github.com/massgov/mass/pull/118 is in progress but hasn't actually been merged and doesn't make any changes to the vagrant itself. It seems to me that something like https://github.com/massgov/mass/pull/96/files#diff-29944324a3cbf9f4bd0162dfe3975d88R18 would be required in the box, but I haven't tested that yet.

[becw]

I think I closed this because the Mass.gov PR was closed. Selenium is not installed on the drupalbox.

The drupalbox should try to match Circle on this: https://circleci.com/docs/build-image-precise/#browsers