validate and match prepared statement SQL query

see #50

introduced regression after fix

fixes introduced regression from #37

Fixes false positives with Exec and Query expectations

Fixes false positives with Exec and Query expectations, see #37

A fix to slice argument matching

A bug was introduced after refactoring the argument matching #35
reflect.DeepEqual should cover all possible cases

Convert expected arguments to driver.Values

• converts expected arguments to driver.Value and compares by strict matching.
• added AnyArg function to create an argument which match any kind of argument.
• added go1.6 test case for expected prepared statement close error, was not supported befor 1.6 version

This release may have impact on argument matching, since it is stricter for time.Time comparison.