This aims to speed up both the ghost application and tests by
migration from usage of config() to just an object of config.

no relevant issue

- Change 'loadConfig' task to 'ensureConfig' to more accurately reflect
what it is actually doing.  Its sole purpose is to make sure a `config.js`
 file exists, and as such the name now reflects that purpose.

- Update config/index.js to export the ghostConfig object directly
so that it can be accessed from other modules

- Update all references of config(). to config.
This was a blind global find all and replace, treat it as such.

- Fixes to tests to support new config access method

- Allow each test to still work when invoked invidually
Merge pull request #3344 from hswolff/test-speedup

Speedup tests