updated Ember to latest release
Merge pull request #3361 from simplabs/update-ember

Updated Ember to 1.6.1
Upgrading Casper to potential 1.0 version
updating tests to match casper
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