Adding Bind variable support for PreparedStatements

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I've done some local work to solve this for myself, can you add this or would 
you need to test more extensively.

1. update Literal.java, by adding before abstract method:
public static final String BINDVARIABLE = "?";

2. update StringLiteral.java's method, by adding after null check:

if (Literal.BINDVARIABLE.equals(s)) return s;

Use this is:
select.addCriteria(new MatchCriteria(<table>, <column>, <criteria>, 
Literal.BINDVARIABLE));

regards
Mark

Original issue reported on code.google.com by mark.gay...@gmail.com on 11 Jun 2011 at 6:02