Example:

    = select(report, "campaign_ids") do
      - available_campaigns.each do |c|
        %option{:data => {:tags => c.tags.to_json}, :value => c.id}= c.name

[ci skip] Add `null` type modifier in migrations.md.

Only output Server logs in Development

Right now when you start a server via `rails s`, the logger gets extended so that it logs to the file system and also to stdout. This extension behavior is not "intelligent" and if the default logger is already set to output to stdout, then the contents will be received twice.

To capture logs in accordance with http://www.12factor.net/logs some platforms require the logs to be sent to standard out. If a logger is set to stdout, and the server is started using `rails server` instead of another method (i.e. `thin start` etc.) then the app will produce double logs.

This PR fixes the issue by only extending the logger to standard out in the development environment. So that in production you don't get double logs like this:

```
ActionView::Template::Error (wrong number of arguments (5 for 4)):
    1: <% lang_index = 0 %>
    2: <div class="row">
    3:   <ul class="nav nav-tabs nav-stacked span2" data-tabs="tabs" id="repo-tabs">
    4:     <% repos.group_by(&:language).each do |lang, repos| %>
    5:       <% unless lang == nil %>
    6:         <li><a href="#<%= "#{lang.parameterize}#{lang.hash}" %>" data-toggle="tab"><%= lang %></a></li>
    7:       <% end -%>
  app/views/shared/_repos.html.erb:4:in `_app_views_shared__repos_html_erb___1685450633638247395_70300668607000'
  app/views/pages/index.html.erb:13:in `_app_views_pages_index_html_erb__2084723628308867770_70300687584880'

ActionView::Template::Error (wrong number of arguments (5 for 4)):
    1: <% lang_index = 0 %>
    2: <div class="row">
    3:   <ul class="nav nav-tabs nav-stacked span2" data-tabs="tabs" id="repo-tabs">
    4:     <% repos.group_by(&:language).each do |lang, repos| %>
    5:       <% unless lang == nil %>
    6:         <li><a href="#<%= "#{lang.parameterize}#{lang.hash}" %>" data-toggle="tab"><%= lang %></a></li>
    7:       <% end -%>
  app/views/shared/_repos.html.erb:4:in `_app_views_shared__repos_html_erb___1685450633638247395_70300668607000'
  app/views/pages/index.html.erb:13:in `_app_views_pages_index_html_erb__2084723628308867770_70300687584880'
```

ATP Railties. Opened against master in favor of #10999

Rewrite Journey::Visitors::Formatter for performance

Prevent server blow up when iterating over TimeWithZone Range

handle `:namespace` form option in collection labels

Dump UUID default functions to schema.rb [2nd version]. Fixes #10751.

Conflicts:
	activerecord/CHANGELOG.md

Fixed a bug in  when using has_many association with :inverse_of option and UUID primary key.

Conflicts:
	activerecord/CHANGELOG.md

[ci skip] Add some comment about downcase url encoded string. 

[ci skip] Add missing migrate step in generating comment resource section.

Fix typo. This test isn't executed even in the postgresql.

This will make easier to hook protected_attributes gem in our code
without making that gem fragile to change in Rails code base.

Closes #12243

Removes (redundant?) sentence fragment in intro text

[ci skip] Fix a typo in Engines.md.

Looks like a remnant sentence fragment from the 3.2 guide.

Remove unused AV helper fixtures from e10a2531

Documentation Fix: Remove broken link on rails 3 guide

Closes #12300

Bust the template digest cache key when details are changed

Allow attaching to AS::Notifications namespace up front

DRYing up method_missing code; Initializing Codepoint object with default values

As raised in https://github.com/rails/rails/issues/12300
[ci skip]

Before, you were required to attach *after* adding the methods to the
class, since the attachment process needed the methods to be present.

With this change, any new method will also be attached to the configured
namespace.

Allow failures in jruby-head

Run Tests against JRuby master

Many of the failing tests in rails test suite fail because of missing encoding support, example #11739


And according to recent announcement, lot of encoding issues have been fixed in current master.  http://ruby.11.x6.nabble.com/Big-encoding-patches-landed-on-master-td4993719.html


So lets test against JRuby master & incase there are still bugs. it would be easier to report them to JRuby.

Fix incorrect assert_redirected_to failure message

The previous regex was allowing `_` in the URI scheme, which is not
allowed by RFC 3986. This change brings the regex in line with the RFC.

In some instances, `assert_redirected_to` assertion was returning an
incorrect and misleading failure message when the assertion failed.
This was due to a disconnect in how the assertion computes the redirect
string for the failure message and how `redirect_to` computes the
string that is actually used for redirection.

I made the `_compute_redirect_to_loaction` method used by `redirect_to`
public and call that from the method `assert_redirect_to` uses to
calculate the URL.

The reveals a new test failure due to the regex used by
`_compute_redirect_to_location` allow `_` in the URL scheme.