readme updates

comments, minor cleanups

rewrote the stinking pile of code that was blockParagraph

tab expansion fixed to handle multibyte unicode characters

gofmt

allocate new buffers on stack; mild speed improvement

export all names from Renderer struct
This enables new back-ends that are not part of the package
Basically a big search-and-replace for this commit

performance fix: with autolinking on, it is almost twice as fast now

remove dependency on less function

readme tweak

rudimentary latex backend, additional cleanup

split parser into multiple files, clean up naming

cleanup in markdown: better naming, misc fixes

comments on performance

fix smartypants and html entity escaping

escape entities when using smartypants

return result instead of taking buffer as input

features list

mdash

readme file

refactored into a proper package

smartypants

cleanup

compatibility fixes

output matches upskirt for markdown test suite

fixing link parsing

basics working, still a few renderers to write

parsing done but untested

working on inline parsing

emph parsing

reference extraction

setup, starting reference handling

fixed ordered lists

all block-level parsers

working on listitem

initial commit