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* Introduce MacroExpander The job of the MacroExpander is turning a stream of possibly expandable tokens, as obtained from the Lexer, into a stream of non-expandable tokens (in KaTeX, even though they may well be expandable in TeX) which can be processed by the Parser. The challenge here is that we don't have mode-specific lexer implementations any more, so we need to do everything on the token level, including reassembly of sizes and colors. * Make macros available in development server Now one can specify macro definitions like \foo=bar as part of the query string and use these macros in the formula being typeset. * Add tests for macro expansions * Handle end of input in special groups This avoids an infinite loop if input ends prematurely. * Simplify parseSpecialGroup The parseSpecialGroup methos now returns a single token spanning the whole special group, and leaves matching that string against a suitable regular expression to whoever is calling the method. Suggested by @cbreeden. * Incorporate review suggestions Add improvements suggested by Kevin Barabash during review. * Input range sanity checks Ensure that both tokens of a token range come from the same lexer, and that the range has a non-negative length. * Improved wording of two comments