Converted indention to a consistent format (4 spaces instead of tabs & spaces)

- PSR-2 states that indention should be space-based. 4 spaces per indention level.
  See: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md
Implemented forward-compatibility for using ee() in place of $this->EE
Merge pull request #1 from tylerwillingham/master

Fix inconsistent indention + replaced $this->EE with ee()