Revert "Change permissions of alisa.conf to 750"

This reverts commit 8cb28d97a5b88ec4625a1f4569abb4c5bf3ae225.
Fix steps wrt alisa.conf in README

Appearently git doesn't preserve full file permissions[1]. And yes, I meant 640
instead of 750.

[1] http://git.661346.n2.nabble.com/why-not-preserve-file-permissions-tp1619926p1620446.html