More improvements in slugs.

dotfiles/zprezto_custom/jekyll/init.zsh

@@ -74,7 +74,12 @@ function jekyll {
   JTEMPLATE+="category: Blog\n"
   JTEMPLATE+="---\n\n"
   TITLE=${@[2,-1]}
-  SLUG=$(echo -n ${TITLE}|tr A-Z a-z|tr -c -s -- a-z0-9 -|sed 's/^-*\([^-].*[^-]\)-*$/\1/')
+  SLUG=$(echo -n ${TITLE} |
+    tr A-Z a-z |                      # Everything in lower case
+    tr -d "'" |                       # Remove single quotes entirely
+    tr -c -s -- a-z0-9 - |            # Replace non-alphanums with dashes
+    sed 's/^-*\([^-].*[^-]\)-*$/\1/'  # Remove leading and trailing slashes
+  )
   DATE=`date +%Y-%m-%d`
 
   case "${1:-help}" in