Pipelines - Builds - Truncate Duration and Finished columns for smaller browser widths

Currently we write out the full time and finished at duration for builds within the table. Truncating 5 minutes 12 seconds to 5m 12s on smaller screens makes it easier to read.

Original:

Screen_Shot_2016-07-07_at_2.25.55_PM

Proposed:

Screen_Shot_2016-07-07_at_2.29.09_PM