[Added regression tests to run_tests.bash
tobias@goedderz.info**20150217132739
 Ignore-this: d4828fe4a7b94295fe40cfe5d9e33f73
] 
<
[Added a regression test for a bug introduced while replacing Subst by a Data.Map
tobias@goedderz.info**20150213104721
 Ignore-this: 989de578539492fac02cfedf7c6eea8e
] 
> hunk ./run_tests.bash 4
+regression_tests_dir=regression_tests
hunk ./run_tests.bash 22
-parallel -j"$threads" bash ./run_test.bash ::: "${tests_dir}"/*.bat
+parallel -j"$threads" bash ./run_test.bash ::: \
+    "${tests_dir}"/*.bat \
+    "${regression_tests_dir}"/*.bat