require terminado >= 0.3.3 for terminal handlers

IPython/html/terminal/__init__.py

@@ -1,20 +1,27 b''
 import os
+
+import terminado
+from IPython.utils.version import check_version
+
+if not check_version(terminado.__version__, '0.3.3'):
+    raise ImportError("terminado >= 0.3.3 required, found %s" % terminado.__version__)
+
 from terminado import NamedTermManager
 from tornado.log import app_log
 from IPython.html.utils import url_path_join as ujoin
 from .handlers import TerminalHandler, TermSocket
 from . import api_handlers
 
 def initialize(webapp):
     shell = os.environ.get('SHELL', 'sh')
     terminal_manager = webapp.settings['terminal_manager'] = NamedTermManager(shell_command=[shell])
     terminal_manager.log = app_log
     base_url = webapp.settings['base_url']
     handlers = [
         (ujoin(base_url, r"/terminals/(\w+)"), TerminalHandler),
         (ujoin(base_url, r"/terminals/websocket/(\w+)"), TermSocket,
              {'term_manager': terminal_manager}),
         (ujoin(base_url, r"/api/terminals"), api_handlers.TerminalRootHandler),
         (ujoin(base_url, r"/api/terminals/(\w+)"), api_handlers.TerminalHandler),
     ]
     webapp.add_handlers(".*$", handlers)
  No newline at end of file