added new blog post on pseudo elements and classes
Added link to custom style sheet

This external stylesheet will include styles that are relevant to the
examples in this blog post.
fixed reference to new stylesheet
removed compiled css from version control
updated reference to styles.css file for this particular blog post
added basic :hover example
added base table of contents for topics
added sections on :active and :checked
worked on hover example more
added a note about open source demos on first example
fixed reference to stylesheet
removed compiled css from version control
Update gruntfile with new scss file