Fixed examples/acroforms/forms.js
Merge pull request #4319 from dferer/forms.js

Fixed examples/acroforms/forms.js
Trying to fix #4166
Merge pull request #4322 from prometheansacrifice/FixUnhandledExistingPageBug

Attempting to fix #4166
Merge branch 'upstream/master'
Merge branch 'master'
bump pdf.js lib version