Update README.md
Add Kruskal Algorithm. Update EKGraphPicture.png, add EKTopsort.png. Fix some NSAssert mistakes
Update CocoaPod to latest
Update CocoaPod to latest
Update README.md
Add gitignore
Merge pull request #71 from AustinChou/master

Add Kruskal Algorithm for EKGraph
DS_Store added to gitignore
Gitignore.
Improved some graph method with NSNumber catalog and NSDictionary catalog
Merge pull request #72 from AustinChou/master

Improved some graph method
Remote user specific files from the tree.
Extract specs for Sorting Algorithms into a separate file.

- Also add naive bubble sort to accompany its improved version already
  present in EKAlgorithms.