Adding support for new Live TV

[nwithan8]

Dug through your source code to find the typical structure for the podcasts, webshows, etc. endpoints. Then dug through network logs while streaming to find the live TV endpoint: https://epg.provider.plex.tv

I'm working on shoehorning it in for a separate Plex-related project, but I'd be happy to roll it into a pull request for this API package. I've also been expanding the (now old) Live TV functionality, creating DVR items, etc. based off issue #182

[nwithan8]

Update: New Directory class for plexapi.video:

@utils.registerPlexObject
class Directory(Video):
    """ Represents a single Directory."""

    TAG = 'Directory'
    TYPE = 'channel'
    METADATA_TYPE = 'channel'

    def _loadData(self, data):
        self._data = data
        self.guid = data.attrib.get('id')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.type = data.attrib.get('type')
        self.items = self.findItems(data)

    def __len__(self):
        return self.size

New method for plexapi.myplex

IPTV = "https://epg.provider.plex.tv/"

def iptv(self):
    """ Returns a list of IPTV Hub items :class:`~plexapi.library.Hub`
    """
    req = requests.get(self.IPTV + 'hubs/sections/all', headers={'X-Plex-Token': self._token})
    elem = ElementTree.fromstring(req.text)
    return self.findItems(elem)

I was going to make a pull request, but I have some outdated, unrelated edits on my fork for Live TV that I don't want to include as part of the PR.

[blacktwin]

There are some builtin tools for what you have in your method:

def iptv(self):
    """ Returns a list of IPTV Hub items :class:`~plexapi.library.Hub`
    """
    data= self.query(self.IPTV + 'hubs/sections/all')
    return self.findItems(data)

or

    return self.fetchItems(self.IPTV + 'hubs/sections/all')

PRs are always welcome.