Merge branch 'release/0.15'
update post: regexs
update post: regexs
Added new jekyll_knit script with proper path for Julin's computer
added post with answers to regex exercises
minor edit for post type and title
update schedule: 2013-03-28
add schedules: 2013-04-25 and 2013-05-02
add author byline
change 'Reading' column to 'Reading / Topic'
update YAML front matter on multiple posts (author/related/due date)