Add various improvements to scroll Thumbnails into view - comments addressed
Fix bug w/ exception not being passed to error callbacks of a Promise
Handle missing 'FontName' entry in FontDescriptor object
Merge pull request #2566 from mduan/issue2099

Handle missing 'FontName' entry in FontDescriptor object
Skip commands that have too few arguments

- Commands that have too few args will be skipped
- Commands that have too many args will generate an info, but still
execute
Merge pull request #2549 from mduan/issue2391

Skip commands that have too few arguments
Do not error when an EndOfPage segment is encountered in jbig2
Supports 'H/V', 'EUC-H/V' and '90ms*' CMaps
Change page with up/down arrow keys when zoom is set to 'page-fit'
Merge branch 'master' of https://github.com/mozilla/pdf.js
Merge pull request #2574 from Snuffleupagus/pagechange-with-up/down-keys-pagefit

Change page with up/down arrow keys when zoom is set to 'page-fit'
Added tests for PDFs having 'H', 'EUC-H', and '90ms' encodings
Merge pull request #2571 from mduan/issue2129

Do not error when an EndOfPage segment is encountered in jbig2
Merge pull request #2567 from vyv03354/master

Supports 'H/V', 'EUC-H/V' and '90ms*' CMaps
Default to a built-in font if an invalid non-embedded font is encountered
Fix normalized CID fonts for direct write 6.1.
Merge pull request #2509 from Snuffleupagus/tweak-thumbnail-scrolling

Add various improvements to scroll Thumbnails into view
Merge pull request #2557 from mduan/issue2391-invalid-font

Default to a built-in font if an invalid non-embedded font is encountered
Updated Chinese Simplified Locale
Merge pull request #2585 from xiaojsoft/master

Updated Chinese Simplified (zh-CN) locale