Add pdfBugEnabled to the default preferences
Disable the developer hash parameters by default in PRODUCTION builds of PDF.js
Lowerize the params to allow case sensitive
Changed to lowercase everywhere the hashParams is compared
Merge pull request #5311 from manolopm/master
Merge branch 'issue-4954' of https://github.com/Snuffleupagus/pdf.js into hashes

Conflicts:
	web/viewer.js
Merge pull request #5320 from yurydelendik/hashes

Merge of the #5311 and #4956