Resolve issue #125, clean CRLF from end of lines

We *definitely* want to get this one in for 0.1.0. I was browsing GitHub and I noticed that there were AsciiDoc documents that weren't rendering at all. After scratching my head a bit, I finally realized that it was probably and endline problem.

Since the reader visits every line, it's relatively straightforward to normalize the end of line character...which makes the parser very happy.