exempt lua test files from docstring requirements

and don't display them with 'ls'

library/Core.cpp

@@ -317,7 +317,7 @@ static void listScripts(PluginManager *plug_mgr, std::map<string,string> &pset,
                 pset[key] = help;
             }
         }
-        else if (all && !files[i].empty() && files[i][0] != '.' && files[i] != "internal")
+        else if (all && !files[i].empty() && files[i][0] != '.' && files[i] != "internal" && files[i] != "test")
         {
             listScripts(plug_mgr, pset, path+files[i]+"/", all, prefix+files[i]+"/");
         }

travis/script-docs.py

@@ -81,7 +81,7 @@ def check_file(fname):
 def main():
     """Check that all DFHack scripts include documentation"""
     err = 0
-    exclude = set(['internal'])
+    exclude = set(['internal', 'test'])
     for root, dirs, files in os.walk(SCRIPT_PATH, topdown=True):
         dirs[:] = [d for d in dirs if d not in exclude]
         for f in files: