added some basic markdown formatting & spell checked

First of all I just wanted to say great project, I'm really looking forward to digging into it for some things I'm working on. 

Just wanted to pitch in a little, so I reformatted your readme to Markdown, which displays a bit more cleanly on GitHub, while maintaining readability in text. You can read the [rendered version here](https://github.com/sroberts/bulbs/blob/readme-to-markdown/README.md). 

Again, thanks for running a great project, and I hope this change helps. :sparkles: