Merge branch 'develop' for v3.0.1

Merge branch 'legacy-v2-develop' into legacy-v2

Merge branch 'develop' into master

Merge branch 'develop'

Merge pull request mathjax#2033 from mathjax/develop

Version 2.7.5

Merge remote-tracking branch 'origin/develop'

Merge pull request mathjax#1925 from mathjax/develop

MathJax v2.7.3

Merge pull request mathjax#1827 from mathjax/develop

Release 2.7.2

Repack and recombine

Merge branch 'develop' into master for 2.7.2-beta.1 release