fix return values; add missing files (doh!)

test/helper.rb

@@ -0,0 +1,3 @@
+require 'rubygems'
+require 'spec'
+require 'lib/decisiontree'

test/test_decisiontree.rb

@@ -8,10 +8,10 @@ describe DecisionTree::ID3Tree do
       [1,0,1],
       [0,1,0]
     ]
-
+        
     dec_tree = DecisionTree::ID3Tree.new(labels, data, 1, :discrete)
     dec_tree.train
-
+        
     dec_tree.predict([1,0]).should == 1
     dec_tree.predict([0,1]).should == 0
   end