General code cleanup

[Calebrw]

Summary of changes

• Implement Composer.json dependencies.
  • phpseclib/phpseclib
  • phpunit/phpunit
• Re-added a required plugin.
  • Pear-based Horde Text_Diff libary included
• Make various changes to codebase to improve and stabilize library.
• Update and create DocBlocks accross the codebase.
• This commit address various issues created, and notes others.

[Calebrw]

Please delete/reject this.

[Calebrw]

@Matthewrbowker Matthewrbowker, please check #95 instead.