Moistly's two-up work.
Merge branch 'master' of https://github.com/mozilla/pdf.js
Revert unnecessary changes.
Use CSS instead of `.style` and JS to run two-up.
Fix jshint errors.
Whitespace fixes.
Remove unnecessary CSS.
Fix a bad bug.
Fix margins.
More margin work.
Add hashParams and about:config storage of prefs.
Address @Snuffleupagus comment.
More margin fixes.
Params bugfix.
Add strings to locale DB.
Call updateViewarea();