* Add disable registration as an environment variable
for docker
* Add REQUIRE_SIGNIN_VIEW as env var to docker
* Add variables to template
* Update docker docs
* Update source installation requirements
We require Golang 1.8 since we use `net/url.PathEscape` which was not introduced until then
* Use Golang 1.8 for build and test
If we state Golang 1.8 we should test using that version as well
* Use golang 1.8 only for single build to see if everything compiles
* Change back edge also for commented out sqlite test
