Merge remote-tracking branch 'umbra/master'

* umbra/master:
  Handle Python to JS boolean conversion
  Allow clicking on already clicked element to continue in behaviors if click_until_hard_timeout is set to true
  Make Umbra click on 'Load More' button for youtube pages
  catch and log exception deleting temporary work directory
  update detection of modal close button for facebook changes
  Add custom behavior for Brooklyn Museum.

brozzler/browser.py

@@ -125,7 +125,11 @@ class Browser:
             if self.is_running():
                 self._chrome_instance.stop()
                 self._chrome_instance = None
-                self._work_dir.cleanup()
+                try:
+                    self._work_dir.cleanup()
+                except:
+                    self.logger.error("exception deleting %s", self._work_dir,
+                                      exc_info=True)
                 self._work_dir = None
                 self._websocket_url = None
         except: