Finish Linked List part
Merge branch 'master' of https://github.com/AustinChou/EKAlgorithms into AustinChou-master

Conflicts:
	EKAlgorithmsApp/EKAlgorithmsExamples/main.m
Added .yml.
Test CI commit.
Update README.md
Update README.md
Tiny cleanups.
Merge branch 'master' of https://github.com/EvgenyKarkan/EKAlgorithms
Merge branch 'master' of https://github.com/EvgenyKarkan/EKAlgorithms

Conflicts:
	.travis.yml
	EKAlgorithmsApp/EKAlgorithmsApp/main.m
	EKAlgorithmsApp/EKAlgorithmsSpecs/EKAlgorithmsSpecs-Prefix.pch
	EKAlgorithmsApp/EKAlgorithmsSpecs/main.m
Fixed 2 compile warnings.