Add Map to Row Function for Insert Statements

[jeffgbutler]

This enhancement allows insert of simple classes like Integers or Strings. An example of usage with insertMultiple follows:

MultiRowInsertStatementProvider<Long> render = insertMultiple(Arrays.asList(11L, 22L, 33L))
    .into(sysUserRole)
    .map(userId).toConstant("1")
    .map(roleId).toRow()
    .build()
    .render(RenderingStrategies.MYBATIS3);

Resolves #593

[coveralls]

Coverage: 100.0%. Remained the same when pulling 77b0765 on jeffgbutler:map-to-row into 2aa431a on mybatis:master.