Revert "Make script type checking more strict"

Don't want to break existing problems.

This reverts commit 811422a18d.

common/lib/capa/capa/capa_problem.py

@@ -436,12 +436,13 @@ class LoncapaProblem(object):
             sys.path = original_path + self._extract_system_path(script)
 
             stype = script.get('type')
-
-            # Require that there be a type, and that the type be one we understand
-            known_types = ['loncapa/python', 'edx/python']
-            if not stype in known_types:
-                continue
-
+            
+            if stype:
+                if 'javascript' in stype:
+                    continue    # skip javascript
+                if 'perl' in stype:
+                    continue        # skip perl
+            # TODO: evaluate only python
             code = script.text
             XMLESC = {"'": "'", """: '"'}
             code = unescape(code, XMLESC)