starting doubly linked lists
Merge branch 'develop' of github.com:obihann/GoDataStructures into doublylinkedlist

* 'develop' of github.com:obihann/GoDataStructures:
  updating the main for more deletes
  adding a delete function
creating a doubly linked list
Merge pull request #8 from obihann/doublylinkedlist

Doublylinkedlist