Upgrade some dependencies

 * Matches https://gerrit.wikimedia.org/r/155790

 * Gets rid of the dtrace-provider optional binary dep. from bunyan.

 * Bump src to b484f639b747022e6bf77aa85b33a6dc9f0aa47f

Change-Id: I8a5cc440ee9e750652c74e112ba56460fcb30983