Release 0.4 Week 3

This week I finished all PRs that were assigned to me last week:

• https://github.com/manrajgrover/algorithms-js/pull/66
• https://github.com/manrajgrover/algorithms-js/pull/67
• https://github.com/manrajgrover/algorithms-js/pull/68

Description of these functions can be found here

Third PR does not pass checks, because it uses function written in one of the previous PRs which was not merged yet.