Merge pull request #61 from EvgenyKarkan/new

Cleaner -[NSArray isSorted]
Format.
Merge branch 'master' of https://github.com/EvgenyKarkan/EKAlgorithms
Add Binary Heap data structure
Finish Dijkstra Algorithm
Finish Topsort Algorithm
Merge remote-tracking branch 'upstream/master'
Merge pull request #62 from AustinChou/master

Add binary heap data structure, also finish two graph algorithm
Update README.md
Insertion sort: cleaner implementation and tests