Merge pull request #56 from EvgenyKarkan/new

Add Cartesian quadrants selection algorithms.
Update README.md
Cartesian quadrant selection: add one more bitwise algorithm
Updated main.m
Merge branch 'master' of https://github.com/EvgenyKarkan/EKAlgorithms
Cartesian quadrant selection: use NS_INLINE and add link to detailed discussion
Cartesian quadrant selection: remove obsolete lines
Merge branch 'master' of https://github.com/EvgenyKarkan/EKAlgorithms
Quick Sort: add tests
Better -[NSArray hasDuplicates]