BFS generic type implemetation

[jitendra3109]

Please review it and merge it so it will benefit others also.

[jitendra3109]

Quicksort has bug previous code and having less time to fixed existing logic instead of I implemented.
So it will we nice to merge it,

[jitendra3109]

What is the issue I could not get it?

[INFO] Compiling 87 source files to /home/travis/build/pedrovgs/Algorithms/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------

[ERROR] /home/travis/build/pedrovgs/Algorithms/src/main/java/com/github/pedrovgs/problem81/BreadthFirstSearch.java:[20,47] diamond operator is not supported in -source 1.5
(use -source 7 or higher to enable diamond operator)

[pedrovgs]

Thanks for your contribution @jsroyal! But before merging this PR you have to get the checkstyle passing and cover the new algorithm with tests. Here you can find some information about how to configure the project checkstyle 😃