Merge pull request mathjax#1638 from mathjax/develop

v2.7.0 release

Update Contrib to always use https, and repack MathJax.js

Merge pull request mathjax#1382 from mathjax/develop

Merge develop into master for 2.6.1 release

Merge pull request mathjax#1380 from mathjax/issue1346

package.json: bump version to 2.6.1-rc.1

Merge pull request mathjax#1345 from mathjax/develop

Release v2.6.0

Change cache-breaking value in MathJax.js

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