Allow members to give us a blog feed, and planet to consume it.

[rollercow]

SUCS Planet is increasingly populated with ex and alumni members. We should allow members to add there own blog feeds using the /Options interface and have planet pick up/augment its list from there.

[chckens]

Planet's configuration is stored in a .ini file. Feeds are added to it in the format:

 http://www.example.com/rssfeed name=examplecom face=examplecom.png

I imagine planet configuration files could be generated in a manner similar to the motd component. Add a database field for feed url to each member, then iterate through these to generate a new planet config.ini whenever someone updates their feed.

[chckens]

Must. Preview. Posts.

[http://www.example.com/rssfeed]
name=examplecom
face=examplecom.png

is how that should have looked.

[chckens]

(In [419]) Allow members to specify a blog feed in the options component, and generate planet configuration files dynamically. Fixes #64