Megatron

    * Experimental ratio shorthand ref #573 @yaxu
    * Store mininotation source location(s) in events ref #245 @yaxu
    * Add more things to tidal-parse @dktr0 @yaxu
    * Separate out haskell parser from tidal-parse into new hackage module called 'haskellish' @dktr0
    * Support patterning polyrhythmic % steps in mininotation @yaxu
    * Fixes to emacs plugin (tidal.el) @xmacex
    * New parameters for freq, overgain, overshape, and missing midi params including the new nrpn ones @yaxu