Merge pull request #53 from jcp510/master

Add Carlos' blog
Update blogs.md
Remove .DS_Store and add .gitignore file
Remove all .DS_Store files
Add README.md for dom-exercises
Update css.md
Add first draft on TDD
Merge branch 'master' of https://github.com/sf-wdi-14/notes
Update README.md
Add directories for dom exercises
Update lecture notes for introduction-to-dom
Update exercise 3 of 3 for dom-exercises
Change word 'snapshot' to 'screen-shot' in DOM README.md
Add hyperlinks to Cho's lectures
Style Carlos' about me page
Merge branch 'master' of https://github.com/sf-wdi-14/notes