fix num pages in CUP, search in Freitag, and search for some rare cases for EEBO (tests work locally)
JabRef group improvements

* More robust slash unescaping for JabRef group import
* Handle JabRef group intersection

Closes #605
small fixes for ASCO, BW, and Cambridge U. Test updates for Columbia U Press
fix multiples and borderline cases in GALE results
[Primo] Favor Details link. Improve PNX detection
add a sici? to JSTOR target regex for referal links from WoS
[zotero.org] Monitor DOM changes and use correct xpaths.
[zotero.org] Don't include attachments in multiples.
Also remove monitorDOMChanges.
remove DESCRIPTOR tag in RIS which is redundant and invalid/breaks our RIS type detection. Update tests for keyword format change
[EM] Look for prefix definitions in html and head "prefix" attributes
[EM] Allow multiple predicates inside name/property attribute
small fixes to CanLII, Zeit, Epicurious, Foreign Affairs
small Google Books & Patents fixes
large repair on OSTI. Be more picky about TOCs for IoP, test update for IPAP
also attach dissertation (and other?) previews
a bunch of small fixes
more small fixes or test updates
HuffPo dates, ProjectMuse clean up abstracts
[NPG] Try to compensate for authors that are missing from EM data
Closes #625
Merge branch 'master' of git://github.com/zotero/translators