R1:089d8327b3cc

Fix regenerate arcanist cert, setup stuff and avoid accept non valid image files as profile picture.

Summary:
Well, since I couldn't regenerate my arcanist cert I figured out that this wass because "workflows" are unavailable there now. I really can not figure out why but it was.
I added in the setup script, the ability to check if is present the protocol of the host and if it has a trailing slash a the end of the line, since both are needed to generate the cert.

Users now only be able to upload valid…