Merge branch 'config-file'

* config-file:
  use a json file as config
Concur with the standard of time-zone offsets.

UTC offsets should be negative west of the Prime Meridian and positive
to the east of it.
Merge branch 'fix-utc-offset'

* fix-utc-offset:
  Concur with the standard of time-zone offsets.
Set the correct content-type for /rss
Merge branch 'fix-rss-content-type'

* fix-rss-content-type:
  Set the correct content-type for /rss
add config options for site-specific rss fields
Merge branch 'new-config' into config-file

* new-config:
  add config options for site-specific rss fields
  Set the correct content-type for /rss
  Concur with the standard of time-zone offsets.
Remove posts & template dirs from config

There are still some hardcoded links in the app. Setting them
in the config would break things.