Updated to declare 'i' and 'j' as variables so they're not attached to the global scope.

Kind of nit-picky, I know, but it's standing out to me like a trailing comma or missing closing brace.
Merge pull request #7 from kevinwestern/patch-1

'i' and 'j' should be declared as variables.
Added insertion sort
Moved insertion sort, updated merge sort recursive
Fixed merge sort, added quicksort
Fixed quicksort
Rename README to README.md
Merge pull request #9 from devinrhode2/patch-1

Rename README to README.md