While the 'backlinks' method has a 'redirect' option,
there is no such option for the 'embeddedin' method.

See 90b87566 for context

Also change link to the slightly user-friendly Phabricator (the url looks nicer without the escaped slash, too)

Removing unsued import

From client.py: time, random, sys, weakref
From sleep.py: random

Merging changes from mwclient master

Since CirrusSearch (and Lucene?) doesn't support 'title'.

Since default values are evaluated only once, mutable objects shouldn't be used.

I've no idea when this would actually be needed, but at least it should be fixed now.. It broke during the move to use the requests library.

log.warn has been deprecated

- Moving code related to waiting/sleeping/retrying into a new class for a more object oriented approach.
- Removing any reference to wait "tokens" to avoid confusion with edit tokens.
- Note: `max_retries` and `retry_timeout` are no longer available on `Site`, but can still be passed into the constructor as before.

- The method has been broken since the move to requests (wrong number of args sent to self.site.connection.get)
- Add option to stream the file to a file object

Should at least be compatible with Python 3.4 now.
Can't get Python 3.3 to work locally, but let's see with Travis.

- Factor out parse_timestamp
- Use `iterkeys`, `itervalues`, `iteritems` and `next` from six
- Use __next__ for Python 3.x and next for Python2.x

- Add zip_safe flag

- Add a warning to prepare for the merge of #81
- Update existing deprecation warnings

If we get a connection error during Site init, it's better to let the
exception through directly since it can well be due to a hostname typo.

The flag has always been named 'messages', not
'message', but has been documented wrongly.

Adding pageid, contentmodel, pagelanguage, restrictiontypes as attributes of Page

Thoses attributes were only accessible through private _info dict.