[prototype] Resizable editor

[daveajrussell]

Prototyping a codemirror extension that adds a resize drag handle to the editor.

It works by;

• Calculating a delta between a mousedown and mousemove event, so we can set the height of the editor

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Latest commit: 4f9986f

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[nnecla]

This seems like a nice addition. I was wondering if we can do this a bit more easily. I believe we can use pure css, and possibly add resize: vertical;(may be get it as a prop?) and overflow: auto; to the wrapper of .cm-editor? We can also change the look of the handle to something better using css again. This is how it looked when I added the styles via the dev tools:

resizable.mov