Update README.md

I've been trying to piece together information about your board and the HM-10, but it's been difficult because different bits of information are at different URLs, there are different versions of the board, etc.. I've made a bill of materials with links to DigiKey and outlined what exactly needs to be populated on the board. I've also updated the link section to provide more places for the curious to look for information. Additionally, I've embedded the rasterized images of the board into the top of the readme so that it's easy to tell what you're looking at. Also, to help people find this board, might I recommend retitling the repository "HM-10 Breakout"?
![screen shot 2014-04-13 at 2 04 03 pm](https://cloud.githubusercontent.com/assets/924295/2690350/78a61eea-c33e-11e3-8ba4-ff24e2ee88f9.png)