v1.3 push_swap working with a list until 7 numbers

V1.3 Push Swap

Now working to sort a list with:

• from 2 until 7 numbers

Bugs just fixed:

• New movement functions, which uses the cheapest cost of a given stack

Project in TDD (Test Driven Development)

• 40 automated tests with 134 assertions

Still TODO:

• make test for a list with 8 or more numbers
• make test for negative numbers
• make test for double or more signs (-- +++)
• outside int_max range
• outside int_min range

What's Changed

• Bug/fixing 3rd step by @biralavor in #9

Full Changelog: v1.2...v1.3