'Quick find' implemented YAY
Added 'Quick Union' and docs for 'Quick Find'
Added 'Quick Union' with weight optimisation.
New slicing syntax in "Quick Union Weighted".

- Also Added 'show_vec' & 'show_sizes' to everyone.
- Added Ruby version of "Quick Union Weighted". (for control)
Merge branch 'master' of https://github.com/goyox86/algorithms

* 'master' of https://github.com/goyox86/algorithms:
  Initial commit