In case you haven't heard of it, you might want to take a look at LeanPub, who specialize in books that are published while they are being written, have a particular focus on Software Development books, and accept manuscripts written in Markdown stored in a Dropbox folder. You can then take the finished LeanPub book to a print-on-demand company like Lulu or CreateSpace to created printed books as well:
https://leanpub.com/authors
I actually assumed you were making a LeanPub book, and was considering buying the work in progress.
I'll definitely be keeping an eye on this. Do you intend on turning this into a book and perhaps publishing physical copies?