Flashes won't clear when using redis-backed session storage

[iandelahorne]

Seeing that buffalo uses gorilla's sessions package, I wanted to replace the cookie storage with a redis-backed storage from gopkg.in/boj/redistore.v1. When I did this, flash messages won't clear after dismissing them and reloading the page.

I created a repo at lflux/sessionthing where you can reproduce this by:

1. Setting up a Redis server at :6379
2. Cloning the repo and running buffalo dev
3. Visit http://localhost:3000/flash which will redirect to /
4. See the flash message Success flash. Dismiss and reload the page
5. The flash message will persist.

By setting useRedis = false in app.go which uses the default cookie storage, the flash message will no longer persist over page loads.

[paganotoni]

I Looked into this one, our problem seems to be in here If we remove the Save call it works for Redis, but will not work for our default session store.

[stanislas-m]

Fixed with #1141.