Merge pull request #228 from SPARTAN563/remove_keys

Refactor out keys field
Changes some indentations from 4-spaces to tabs
Changes some indentations from 4-spaces to tabs

In Model.js
Changes Readme test command to 'npm test', reindents package.json
Fixes Model.aggregate().call() to accept no arguments except function name
Fixes some aggregate bugs, updates aggregate tests
Reindents Utilities to tabs, adds some optimizations
Adds Utilities.getRealPath to look for the real path to load based on the file where it was called from (for db.load and db.use)
Adds tests for db.use(plugin)
Removes unused connection in ORM test
Fixes #226 - hasOne delAccessor not working
Merge branch 'master' of https://github.com/dresende/node-orm2