Tools/project - project dir should be the list

The project dir if using just project.py shall be a list of directories.

Author: 0xc0170

tools/project.py

@@ -205,12 +205,12 @@
 
             # Build the project with the same directory structure of the mbed online IDE
             project_name = test.id
-            project_dir = join(EXPORT_WORKSPACE, project_name)
+            project_dir = [join(EXPORT_WORKSPACE, project_name)]
             project_temp = EXPORT_TMP
-            setup_user_prj(project_dir, test.source_dir, test.dependencies)
+            setup_user_prj(project_dir[0], test.source_dir, test.dependencies)
 
         # Export to selected toolchain
-        tmp_path, report = export(project_dir, project_name, ide, mcu, project_dir, project_temp, clean=clean, zip=zip, extra_symbols=lib_symbols, relative=sources_relative)
+        tmp_path, report = export(project_dir, project_name, ide, mcu, project_dir[0], project_temp, clean=clean, zip=zip, extra_symbols=lib_symbols, relative=sources_relative)
         if report['success']:
             zip_path = join(EXPORT_DIR, "%s_%s_%s.zip" % (project_name, ide, mcu))
             if zip: