Delete Johnny Cache support; update debug toolbar panels.

Johnny Cache is broken under Django 1.6.
Work around sites with a missing unique constraint.

Should resolve issue #172.
Use console e-mail backend when running under Travis.
Missed line.. ugh.
nginx: Include port in proxied 'Host:' header.

Closes #160, which describes the peril its absence can cause.
api: add pictures/ endpoint.
Created v1 Fullscreen Taplist
Fullscreen improvements.

- Rename 'taplist' -> 'fullscreen'.
- Render by tap, not by keg.
- Move link to main page.
Cleanup: Remove executable bits from random, non-executable files.