Decrease the priority of the mml2jax preprocessors, so that the ASCIIMath/TeX/jsMath annotations inside MathML are not parsed. Fix issue #484.
Fix typo in previous commit.
Merge pull request #539 from fred-wang/issue492

Resolves issue #492
Merge pull request #540 from fred-wang/issue529

Resolves issue #492
Merge pull request #541 from fred-wang/issue484-bis

Resolves issue #484 and #506 (duplicate)
Merge branch 'master' into i18n