First pass at KaTeX plugin

Finally fixes #458 thanks to the KaTeX plugin from Khan Academy

plugins/tiddlywiki/katex/files/README.md

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+# [<img src="https://khan.github.io/KaTeX/katex-logo.svg" width="130" alt="KaTeX">](http://khan.github.io/KaTeX/) [![Build Status](https://travis-ci.org/Khan/KaTeX.svg?branch=master)](https://travis-ci.org/Khan/KaTeX)
+
+KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
+
+ * **Fast:** KaTeX renders its math synchronously and doesn't need to reflow the page. See how it compares to a competitor in [this speed test](http://jsperf.com/katex-vs-mathjax/).
+ * **Print quality:** KaTeX’s layout is based on Donald Knuth’s TeX, the gold standard for math typesetting.
+ * **Self contained:** KaTeX has no dependencies and can easily be bundled with your website resources.
+ * **Server side rendering:** KaTeX produces the same output regardless of browser or environment, so you can pre-render expressions using Node.js and send them as plain HTML.
+
+KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, and IE 8 - IE 11.
+
+## Usage
+
+Download the built files from [the releases page](https://github.com/khan/katex/releases). Include the `katex.min.js` and `katex.min.css` files on your page:
+
+```html
+<link rel="stylesheet" type="text/css" href="/path/to/katex.min.css">
+<script src="/path/to/katex.min.js" type="text/javascript"></script>
+```
+
+Call `katex.render` with a TeX expression and a DOM element to render into:
+
+```js
+katex.render("c = \\pm\\sqrt{a^2 + b^2}", element);
+```
+
+To generate HTML on the server, you can use `katex.renderToString`:
+
+```js
+var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
+// '<span class="katex">...</span>'
+```
+
+Make sure to include the CSS and font files, but there is no need to include the JavaScript.
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## License
+
+KaTeX is licenced under the [MIT License](http://opensource.org/licenses/MIT).

plugins/tiddlywiki/katex/files/tiddlywiki.files

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+{
+	"tiddlers": [
+		{
+			"file": "fonts/KaTeX_AMS-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_AMS-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Main-Bold.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Main-Bold.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Main-Italic.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Main-Italic.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Main-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Main-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Math-BoldItalic.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Math-BoldItalic.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Math-Italic.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Math-Italic.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Math-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Math-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Size1-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Size1-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Size2-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Size2-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Size3-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Size3-Regular.woff"
+			}
+		},{
+			"file": "fonts/KaTeX_Size4-Regular.woff",
+			"fields": {
+				"type": "application/font-woff",
+				"title": "$:/plugins/tiddlywiki/katex/fonts/KaTeX_Size4-Regular.woff"
+			}
+		},{
+			"file": "katex.without-font-face.min.css",
+			"fields": {
+				"type": "text/plain",
+				"title": "$:/plugins/tiddlywiki/katex/katex.min.css"
+			}
+		},{
+			"file": "katex.min.js",
+			"fields": {
+				"type": "application/javascript",
+				"title": "$:/plugins/tiddlywiki/katex/katex.min.js",
+				"module-type": "library"
+			}
+		}
+	]
+}