Add pass fail light-feature

First iteration scrapes TeamCity home page to get list of projects and parses to determine whether they have any failing builds. During the beginning of each query, the pass/fail-light combination will toggle back and forth. Then, depending on the scraping outcome, either the pass or fail light will remain on – until the next query.

Note: Would have preferred to use their API, but did not see any way to get active branch-builds and ***only*** retrieve latest builds from each project.