Step by step Composer installation instructions, including a composer.json example.
In addition:
- Removed self-page reference to an introduction
- Removed reference to PEAR installation instructions due to end of life
- Removed reference to Ruby as doesn't add value
- Shortened testing via Web Browser section (as covered in Composer installation instructions)
- Moved some docs around to reflect this change
- Described how to symlink from vendor/bin/phpunit
- Added note about browser-runs not being recommended
- Added more examples on how to run through "sake",
to complement the existing descriptions for "phpunit"