Disable SSL peer verification for all webhooks

SSL peer verification was silently enabled by the HTTParty upgrade in
8a54fda45957b3755f7c06e5c9b955c794488ff1. This patch restores the
previous behaviour of GitLab 6.3 and earlier.
Fix logic for blocked user on pam code
squash! Update comment in lib/gitlab/pam/user.rb
Merge branch '6-4-pam' into 6-4-pam-stable
Merge branch '6-4-stable' into 6-4-pam-stable