builds unit_tests binary in PASTIS_BINARY_DIR for more visibility

tests/CMakeLists.txt

 include_directories("${CATCH_INCLUDE_PATH}")
 
-#set(EXECUTABLE_OUTPUT_PATH ${PASTIS_BINARY_DIR})
+set(EXECUTABLE_OUTPUT_PATH ${PASTIS_BINARY_DIR})
 add_executable (unit_tests
   main.cpp
   example.cpp
@@ -13,10 +13,3 @@ enable_testing()
 
 #parse catch tests
 ParseAndAddCatchTests(unit_tests)
-
-#add_dependencies(check
-#  DEPENDS exec_tests)
-
-add_custom_target(check
-  COMMAND unit_tests
-  DEPENDS unit_tests)