Bring native API in line with pure js version. Fixes #743

[coagmano]

node-postgres abstracts over the pg-native module to provide exactly the same interface as the pure JavaScript version. No other code changes are required. If you find yourself having to change code other than the require statement when switching from require('pg') to require('pg').native please report an issue.

In issue #743 the code breaks using pg-native where the Result.addRow method is used.

This method is missing from the native bindings because libpq loads all rows into memory before handing it to pg-native. The native bindings already simulate emitting row events, but does not replicate the addRow function.

I've added a test in test/integration/client/simple-query-tests.js using Result.addRow.

And an empty function stub in lib/native/result.js which doesn't have to do anything since pg-native accumulates rows by default.

[brianc]

Hey this is a great find & fix! Thank you!! Merging now. :)