Bug: MQTT discovery doesn't work if device name has an apostrophe #53

Might want to add a note about this or maybe do some validation for the device name, but I had set mine to Michael's Desktop and saw that the discovery message was published as: homeassistant/binary_sensor/Michael's Desktop/michael_s_desktop_webcamactive/config, but couldn't find the entities or devices being added to general HA or to the MQTT Integration. I changed my device name to MichaelDesktop and they were then added immediately. I believe spaces have worked in my MQTT names before, but I guess apostrophes don't.