Improvements to Mathjax plugin

[João Palhoto Matos]

I do use MathJax and ckeditor in my sites. But I do not intend to use the mathjax plugin in its current state. There are two reasons:

• All equations end up as inline equations between \( and \). Displayed equations should be automatically detected. It may be hard to do it.
• The sample in ​http://ckeditor.com/ckeditor_4.3_beta/samples/plugins/mathjax/mathjax.html shows the baseline for text and inline equations as being significantly different.