Filter drop-down of executions using user input

[bestchai]

Right now, for comparison clustering, users specify a base execution by choosing from a drop-down of all executions. It would be better to have an input text area that lists matching executions as the user types.

The test() method for regular expressions might come in handy: http://www.w3schools.com/jsref/jsref_regexp_test.asp

[Issue created by pattypcw: 2015-06-24]