corrected typo bundler --> jekyll
added line breaks to exercise
added *.swp to .gitignore
added line breaks to exercise of c1s1 first slide
updated _config.yml to fix pygments warning
gitignore .DS_Store
remove .DS_Store
fixed @name -> @basename issue
renamed .md files and fixed some lists
reordered notes so that the  lesson precedes the exercise
corrected typos etc
changed markdowed markdown converter to redcarpet
reverting back to kramdown
fixed inline HTML for Kramdown
renamed for contiguous ordering
fixed typo, change or -> OR
fixed typo
really fixed the typo, unmatched [..]
added extension exercise summary
added crucial version of jekyll to Gemfile