Update tools/package.json to newer upstream versions

Packages build on a labs instance running ubuntu-12.04-precise.

Most importantly, grunt-contrib-qunit from v0.2.0 to v0.4.0 and its
dependencies (such as phantomjs v1.8.1 to v1.9.7)

Change-Id: If2539ccb3152bd031a7809c276582758492788c4