Remove execute permissions from misc files

A lot of images, fonts, and javascript files had unnecessary execute
permission bits set. I suspect many of these files had these bits set by
the tool used to download them.
Merge pull request #81 from PiPeep/fix-permissions

Remove execute permissions from misc files
Update README.md
jsdom forgotten requirement
Merge pull request #86 from denadai2/patch-2

jsdom forgotten requirement
Merge pull request #85 from denadai2/patch-1

Update README.md