add $? for ruby
add $_, $/, $-0 for Ruby
add utility script to do url encode
add <> for perl
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
add front-matters
Merge branch 'master' into gh-pages
escape special characters which jekyll complained
Merge branch 'master' into gh-pages
further fix for a special character
Merge branch 'master' into gh-pages