allow using the user's email address as a http parameter in gravatar urls for custom avatar systems. For example:
plain_url: "http://avatar.company.com/avatar/?mail=%{email}&size=%{size}"
Temporary fix for #4305: Cant preview attached png images on notes; attachment.secure_url returns an url which is accessible
Fix extra space added in beginning of commit message

Removes extra space in merge commit messages. This seems to have been
introduced by the functionality added in 38d8d749d which allows a user
to change a merge commit message.
Merge remote-tracking branch 'upstream/master' into fix-4305
Only one link per email to prevent clicking the wrong one.
Added the dump.rdb file to gitignore

Whenever i'm working on GitLab I have redis running, but redis is
generating a db dump file called dump.rdb, I dont think that should be
checked in, so it should be on the gitignore list
Add optional parameter to list merge requests

Add an optional parameter to list merge requests to restrict the
returned merge requests to those that are "opened", "merged" or
"closed". By default all merge requests are returned. Note that
"all" can be given to explicitly request all merge requests.
Document the need for dev packages since Multiple people asked about it.
Add rake task to install or upgrade gitlab-shell installation.
Add documentation for new rake task to install gitlab-shell.
Add issue to an empty repo, test.
Nicer formulation.
 Merge branch 'why-all-the-dev' into 'master'

Why all the dev packages

Document the need for dev packages since Multiple people asked about it.

/cc @marc @jacobvosmaer
Fix rake db:seed_fu ENV=development

This problem was reported on https://gitlab.com/gitlab-org/cookbook-gitlab/issues/46
Update installation.md

just fix typo

fix broken links
People forget to compile their assets, start after doing that.
 Merge branch 'installation-order' into 'master'

Installation order
Typo fix in process.md
 Merge branch 'issue_on_empty_repo' into 'master'

Fix for error 500 on create issue for empty repo
Add values to default fields to prevent 500 error when migrate from MySQL to Postgres

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>