Making problems more practical.

Will change some problems around, and remove some and add some, to make this repo more practical and achievable.
Update README-scratch.md
Update README.md
Create CONTRIBUTING.md

On popular demand!
Added ways of contributing!
Now contains only the problems, no blurb!
Describe contributions further!
Added instructions on including sources. Improved formatting.
Count words done
Add link to count_words.py
More python way of limiting results by jrwren
Fixed a weird encoding issue in hyphens
Merge branch 'master' of https://github.com/thekarangoel/Projects
Removed some projects
Removed more very hard, duplicate problems
Moving around some problems into correct categories
Removed more very hard, duplicate problems, sorted categories
Replicate README
Categor readme files updated
Added some problems to Numbers