Feature idea: authors can edit their veyepar metadata to be able to kick off new encoding

[codersquid]

High level description: Sometimes authors email Carl asking if he can cut out things, e.g. 14:56 to 16:34. That's what veyepar volunteers do! so it would be cool if authors could have access to their talks so that they can interact with the input screen and kick off a new encoding.

Figure out what changes need to exist to make this happen. (open up separate issues once there is a more detailed plan).

[CarlFK]

chipy's site has something similar for eding rsvp:

https://github.com/chicagopython/chipy.org/blob/develop/chipy_org/apps/meetings/urls.py#L16
url(r'^rsvp/anonymous/(?P<rsvp_key>[a-z0-9]{40})/$', RSVP.as_view(), name='anonymous_rsvp_with_key'),

https://github.com/chicagopython/chipy.org/blob/develop/chipy_org/apps/meetings/views.py#L61

https://github.com/chicagopython/chipy.org/blob/develop/chipy_org/apps/meetings/models.py#L152

note: use uuid's instead of random, just cuz it is the right thing to do.