Repack and recombine for 2.6-beta.1

Combine updated files

Merge pull request mathjax#1181 from mathjax/hotfix-2.5.3

Merge v2.5.3 for release

Merge pull request mathjax#1166 from mathjax/hotfix-2.5.2

Merge v2.5.2 for release

Merge pull request mathjax#1065 from dpvc/hotfix-2.5

Release of v2.5.1

Merge pull request mathjax#1027 from mathjax/develop

Release v2.5

v2.4 point release.

Update README-branch.txt

v2.2 point release.

v2.1