build update inc. move to rails 4.8

move to local gem fork of openseadragon-rails. Uses latest OSD build. After deployment pul store config needs to be pointed at loris2 as the IIIF base server

minor style tweaks bugfix for #322 modal problems

update to rake 10.4

convert to fluid layouts
correct git reference to OSD-rails fork
Merge pull request #323 from pulibrary/ui_improvements_cont

build update inc. move to rails 4.1.8