Magic link mixed with other extensions

~~http://www.google.com~~

**http://www.google.com**

__http://www.google.com__

^^http://www.google.com^^

~~fake.mail@gmail.com~~

**fake.mail@gmail.com**

^^fake.mail@gmail.com^^

==fake.mail@gmail.com==

These aren't guarunteed to work without being enclosed as
we allow links to trail with = and emails can lead with _.

==<http://www.google.com>==

__<fake.mail@gmail.com>__
