Fix code sample in formatting-strings.
Merge pull request #330 from alexrobbins/strings/formatting-strings-fix

Fix code sample in formatting-strings.
Tweak output format of formatting strings recipe
Merge branch 'master' of https://github.com/clojure-cookbook/clojure-cookbook
Undo one change to reader-literal

IMO, it's important to print the time to highlight how literals work
full-circle.
Edit the 'creating an executable jar' recipe
Add executable jar sample project