Fix notdef typo.
Enable changing page using Shift+Spacebar in presentation mode
Update and cleanup readme.
Merge pull request #3397 from brendandahl/notdef

Fix notdef typo.
Merge pull request #3399 from Snuffleupagus/change-page-shift+space

Enable changing page using Shift+Spacebar in presentation mode
Merge pull request #3402 from brendandahl/readme-update

Update and cleanup readme.