Sub/Superscript support

With the new header using GitHub flavored markdown, I would love to see the superscript and subscript tags integrated into the editor (<sub> and <sup>). This is the biggest thing preventing me from switching to bear for all of my notes. Even if LaTeX support is not added, this would be sufficient for myself, and many others, and make the editor 100x more useful than it already is. I love the new features, this is the one that I think needs to be added to make it the perfect editor.