Do not enable bracket syntax

- For portability purposes (e.g., running the admin on 5.4, but deploying on
  5.3), legacy array syntax should *always* be used.
PSR-4 + QA toolchain

- Updates package structure to use PSR-4
- Adds Coveralls, php-cs-fixer, and Travis-CI support
Update getAutoloaderConfig()

- to point at correct directory