Add equation button #2
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I have added a new button: equation.
The markdown previewer that I am using supports LaTeX-equation, and it has two equation syntax. One is ']', ']'; another is '$$' signs. I prefer '[' + ]' style for some reasons.
Unfortunately, glyphicons has no equation icon, so I has to choose alternative icon: 'superscript'
If you merge this commit, I want to you choose more suitable icon.
Thanks.