Start of a book-ready conventions section
Re-arrange conventions a little bit. Add Typesetting conventions
Add frontmatter as a pseudo-chapter of the book
Formatting for Atlas rendering
Merge pull request #252 from stevenproctor/patch-2

Escape <=, so it doesn't render as a left double arrow
Merge pull request #250 from clojure-cookbook/conventions

Supplement conventions.asciidoc for inclusion in the book's preface
Merge pull request #254 from stevenproctor/patch-3

Update 'method' to be 'function'
Add example for using clj-time for current-date

Some people prefer to use the Joda-Time objects instead of
Java's Date objects for dealing with dates and times.

Provide an example in the description of how one can use clj-time
to interact with Joda-Time objects in addition to the solution
that covers Java Date objects.
Prefix return results with ;;->

Allow for copy/pasting into the repl, as well as align with output
from other examples in the book.
Remove leading => on examples

Allow for copy/pasting into the REPL, as well as match other code
excerpts in the book.
Edits to using clj-time to get current date