Revert referrors from 2D back to the old values from [1]

Update develop branch

docs/conf.py

@@ -13,9 +13,9 @@
 import os
 import sys
 sys.path.insert(0, os.path.abspath('..'))
-sys.path.insert(0, os.path.abspath('../tests/heat'))
-sys.path.insert(0, os.path.abspath('../tests/stress'))
-sys.path.insert(0, os.path.abspath('../tests/r13'))
+sys.path.insert(0, os.path.abspath('../tests/2d_heat'))
+sys.path.insert(0, os.path.abspath('../tests/2d_stress'))
+sys.path.insert(0, os.path.abspath('../tests/2d_r13'))
 sys.path.insert(0, os.path.abspath('../examples'))
 
 # -- Project information -----------------------------------------------------