Removed dependencies. Added RedisIgbinary repository.

- Exceptions now extend \Exception rather than AbstractException.
- Align.php is removed as it was only used in AbstractException.
- kevinlebrun/colors.php dependency is removed as it was only
    used in AbstractException to make things look pretty.
- Added git repo in composer.json for Axvf/RedisIgbinary and
    removed it from src/
- Moved src/Threadable up a directory and changed autoloader
    namespace in composer.json.
- Loader.php autoloader variable will need changing.

Removed :
    - src/AbstractException.
    - src/Redis
    - src/Align
    - src/Factory
    - src/Core
    - tests/Redis*
    - tests/Factory
    - tests/Core

Added :
    - tests/Demo (not a test, just a demo of spawning processes).