Add first problems solution

- Add first problem solution
- Add algorythm skeleton for problem 2
Fix wrong result in problem 2
Add solution to problem 3
Remove unnecesary output
Add solution to problem 6
Add solution to problem 7
Add solution to problem 8
Add solution to problem 10
Merge branch 'master' of github.com:FerPerales/Project-Euler

Conflicts:
	1 - 10/02_even_fibonacci_numbers.rb