v2.0.6

#1080 Redirect orphaned assets URL to the existing asset
#1157 Create monograph page for EPUB
#1161 Better phrase context for matched search terms
#1162 Add search results highlighting
#1170 EPub search url has & in it [BUG]
#1178 Fedora 4.7.4 Upgrade
#1187 EPub Class
#1189 Missing epub search results [BUG]
#1190 CFI ranges don't work [BUG]
#1194 p class="quote" styles in CSB [BUG]
#1195 Remove publisher logo stuff from db:seeds [BUG]
#1196 Missing metadata causes 500 server error [BUG]
#1197 tidy up CSVParser errors
#1202 fix best-fit Leaflet in embed view [BUG]
#1208 custom Able Player for embed view
CSB 71 Cleanup epub.js theme handling