Made Node.h use references for parameters.
Made prototypes for LinkedList methods.
Added constructor and destructor to LinkedList, fixed return value of indexOf and lastIndexOf, and added skeleton for functions.
Fixed Makefile for String.
Updated README.md
Fixed include for LinkedList, and made Makefile.
Created constructor and destructor for LinkedList.
Changed names of GetFirstNode and GetLastNode to GetHead and GetTail. Made a PRIVATE getLastNode method.
Node returns pointers to next and previous instead of references. Removed Standard.h include, hasNextNode, and hasPreviousNode.
Made a const constructor for Node.h, and made setElement take a constant parameter. Also filled in the add and getLastNode methods for LinkedList.
Filled in toString method for LinkedList.
Made linked list double by keeping track of previous node, and keep track of _size now.
Changed getLastNode to getNodeAt to get any Node.
Implemented correct getHead and getTail methods.