merges new_schema branch, adds Travis hooks, and moves to HH 6.x

use the newest Solr schema and config
lock Sufia to HH 6.xwrap registration of local authorities in a begin/rescue block as a workaround
inject Hydra::Controller::ControllerBehavior into Sufia application controller to make sure Sufia::Controller is included
replace references to deprecated AF::NokogiriDatastream
skip TranscodeAudioJob if ffmpeg is not enabled
cucumber task should not be default
lots of trailing whitespace cleanup
ignore new rvm artifacts