result.total type is string in postgres #108

Steps to reproduce

Create a feathers-knex service using postgres and run the find method.

myFeathersKnexService.find({ query: { [field]: value } })
  .then(result => {
    console.log(result.total);
  });

Expected behavior

Returns an integer (e.g. 0)

Actual behavior

Returns a string (e.g. '0')

System configuration

Module versions:
feathers-knex: 2.7.0
knex: 0.13.0
pg: 7.0.1

NodeJS version: v6.11.1

Operating System: Alpine Linux 3.6