changelog for v4.2.0
v4.2.0
merge branch 'federated-matches'
add uglifier so apps don't have to require it
add rails 4 static error pages
explicitly require faraday
add custom iqvoc rdf namespace
Revert "add custom iqvoc rdf namespace"

This reverts commit 889e599b6d5b17155480f1c3355ff2b08161a6fd.
add images to precompile config, meh rails 4

otherwise, 3rd party gem images would not get precompiled
add core assets to precompile config
use font awesome icons throughout
remove unused arrow images
use font awesome icons for spinners throughout
give precompiled assets on heroku another chance
add iqvoc logo as svg

fixes #169
remove mixed whitespace
fix onebox results style
bump iq_rdf
introduce iqvoc's own rdf namespace
fix iq_rdf dependency constraint