Release 0.26.4

# History

## 0.26.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.26.4/bootstrap.sh
sudo DOKKU_TAG=v0.26.4 bash bootstrap.sh
```

### Bug Fixes

- #4899: @josegonzalez Ensure we respect quotes and dollar signs in config vars
- #4890: @josegonzalez Drop which in favor of command -v

### Other

- #4897: @josegonzalez Silence errors when verifying the ssl certificate
- #4891: @dependabot[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 199 to 200 in /tests/apps/php

docs/development/release-process.md

@@ -29,7 +29,7 @@ The workflow looks like this:
 ```shell
 # having dokku-arch in ../dokku-arch
 vagrant up build-arch
-# wait for "==> build-arch: ==> Finished making: dokku 0.26.3-2 (Mon Feb 22 23:20:37 CET 2016)"
+# wait for "==> build-arch: ==> Finished making: dokku 0.26.4-2 (Mon Feb 22 23:20:37 CET 2016)"
 cd ../dokku-arch
 git add PKGBUILD .SRCINFO
 git commit -m 'Update to dokku 0.9.9'