Added Gitignore
Use an Int rather than a Double for h, g, and f
Oops, forgot braces.

Fixed bug where heuristic value was calculated incorrectly
Quite a few things

- Fixed bug in indexed array
- Forgot that values of existing nodes in algorithms change, they need to be readded to the open list
- Adapted to Xcode 6b7
Merge branch 'master' of https://github.com/iluuu1994/Pathfinder