Forgot to copy in the old ronin/formatting/sql specs.
Bundle ronin-support ~> 0.6, since we moved ronin/formatting/sql here.
Modernized the specs.
Added String#sql_unescape.
Speced when String#sql_escape is given the wrong argument.
Fixed doc for String#sql_escape.
Changed how String#sql_escape works.

* Hex encoded Strings do not start with 0x.
* Detect hex encoded Strings with /^[0-9a-f]{2,}$/.
* If the String is not a hex String, pass it to String#sql_unescape.