Fix bug in Browser: Add CSS based Adblock plugin #336

[HollowMan6]

Fix bug when closing buffer:

Traceback (most recent call last):
  File "/home/mt/.emacs.d/site-elisp/emacs-application-framework/app/browser/buffer.py", line 66, in set_adblocker
    self.buffer_widget.load_adblocker()
  File "/home/mt/.emacs.d/site-elisp/emacs-application-framework/core/browser.py", line 107, in load_adblocker
    self.load_css(os.path.join(os.path.dirname(__file__), "adblocker.css"),'adblocker')
  File "/home/mt/.emacs.d/site-elisp/emacs-application-framework/core/browser.py", line 98, in load_css
    self.web_page.runJavaScript(SCRIPT, QWebEngineScript.ApplicationWorld)
RuntimeError: wrapped C/C++ object of type BrowserPage has been deleted

[MatthewZMD]

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