Basic Structure of BST created

BST is fully implemented and not at all tested
Tests should be done in bst, TermNode, and Webpages
Calculating TFIDI not yet implemented
Binary Search Tree is tested and working

Test cases were made and run for BST so the node should be fully
functional as well.
Merge pull request #3 from mkhofmann/PA3-Starting-Code

Pa3 starting code