Merge pull request #1 from cnishina/master

convert to maven project
Merge pull request #3 from cnishina/master

fix parens validation if they match
Merge pull request #4 from cnishina/master

removing extra loop to match open and closed symbols
adding multiple pop test to stack/queue
queue pop method, tail should set the next node to null
Merge pull request #5 from cnishina/master

Doubly linked list
Merge branch 'master' of https://github.com/WhiteBoardDev/java-datastructures
remove comments
Merge pull request #6 from cnishina/master

bstree to linked list. good working session!
Fixing broken medianFinder and adding String Reversal
adding string reversal
adding todos and more algorithm stubs
adding method stub for another LL to BS tree implemtation