fix type in UI
Went with

https://github.com/jteeuwen/go-bindata

to embed all html/css/js resources into the binary. This is super
handy, but causes go et github.com/ojilles/graphite-news to not
work anymore. Hence also checking in the bindata.go so that that
keeps working.

Run `build-dst.sh` to recreate bindata.go from files on disk.