Release 0.1.0

This version includes most of the major items from the current wishlist, including:

• Better keyboard support (via mousetrap.js)
• Support for "small LaTeX" output, so fractions, integrals, summations, etc. do not look bad when appearing inside exponents, limits of integration, or other places where they should appear small
• Text mode now exists
• Callbacks for ready, done, right, and left
• Initialisation bugs fixed
• Symbol output specifications can now be strings, rather than weird lists of alternating strings and integers
• Symbol format, XML data format, and some internals are documented

Mouse support is still not yet implemented.