adding test for select_by_regex
implement select_by_regex.

This method selects all jobs whose string representation contains the regex.
when passed a non-regex, select_by_regex returns no results
In the UI, query by regex
test expectation changed because another failed job was added to the queue
added UI elements for accepting regex
use an input tag instead of a textarea
add select_by_regex info to README
update documentation in UI to show that you can search via regex
escape the inputed regex
Merge branch 'davidann-search_by_regex'