remove old test commands from Makefile (#524)

Author: mmcky

Makefile

@@ -3,16 +3,6 @@
 install:
 	python setup.py install
 
-test-all: test test-examples test-solutions
-
 test:
 	@echo "Running nosetests on test suite ..."
 	nosetests -v
-
-test-examples:
-	@echo "Testing examples ..."
-	python scripts/test-examples.py
-
-test-solutions:
-	@echo "testing solutions ..."
-	python scripts/test-solutions.py