chore(package.json): update dependencies

bower@1.3.2
grunt-contrib-concat@0.4.0
grunt-contrib-connect@0.7.1
grunt-contrib-watch@0.6.1
time-grunt@0.3.1
docs(labels): close unclosed .page-header
chore(package.json): downgrade grunt-contrib-watch

As grunt-contrib-watch is getting too problematic for livereload, we're downgrading it back to v0.5.3.