attributes and recipe names formatted as code

Most markdown parsers identify _*_ as italics. 

So for example, unformatted "ldap:distinguished_name_template" shows unexpected italicized "name". 

This commit formats every attribute and recipe name using back-ticks (for example `ldap:distinguished_name_template`) to get around this problem.
restore "D"

Got chopped off somehow.
Merge pull request #2 from greenmoss/F/README

README attributes and recipe names formatted as code