Add code for tutorial.

p0_tutorial/test_cases/q2/CONFIG

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+max_points: "1"
+class: "PassAllTestsQuestion"

p0_tutorial/test_cases/q2/food_price1.solution

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+# This is the solution file for test_cases/q2/food_price1.test.
+# The result of evaluating the test must equal the below when cast to a string.
+result: "12.25"

p0_tutorial/test_cases/q2/food_price1.test

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+class: "EvalTest"
+success: "buyLotsOfFruit correctly computes the cost of the order"
+failure: "buyLotsOfFruit must compute the correct cost of the order"
+
+# A python expression to be evaluated.  This expression must return the 
+# same result for the student and instructor's code.
+test: "buyLotsOfFruit.buyLotsOfFruit([ ('apples', 2.0), ('pears',3.0), ('limes',4.0) ])"

p0_tutorial/test_cases/q2/food_price2.solution

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+# This is the solution file for test_cases/q2/food_price2.test.
+# The result of evaluating the test must equal the below when cast to a string.
+result: "14.75"

p0_tutorial/test_cases/q2/food_price2.test

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+class: "EvalTest"
+success: "buyLotsOfFruit correctly computes the cost of the order"
+failure: "buyLotsOfFruit must compute the correct cost of the order"
+
+# A python expression to be evaluated.  This expression must return the 
+# same result for the student and instructor's code.
+test: "buyLotsOfFruit.buyLotsOfFruit([ ('apples', 4.0), ('pears',3.0), ('limes',2.0) ])"

p0_tutorial/test_cases/q2/food_price3.solution

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+# This is the solution file for test_cases/q2/food_price3.test.
+# The result of evaluating the test must equal the below when cast to a string.
+result: "6.4375"

p0_tutorial/test_cases/q2/food_price3.test

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+class: "EvalTest"
+success: "buyLotsOfFruit correctly computes the cost of the order"
+failure: "buyLotsOfFruit must compute the correct cost of the order"
+
+# A python expression to be evaluated.  This expression must return the 
+# same result for the student and instructor's code.
+test: "buyLotsOfFruit.buyLotsOfFruit([ ('apples', 1.25), ('pears',1.50), ('limes',1.75) ])"