`hfvalue` parts should always be percent encoded, so lets do that!

Revert "use path escaping for email addresses"

This reverts commit 21ffef38.

Remove mocha from ActionPack tests

converts old ID methods to the new abstract store methods in Rack

Just include the modules necessary in the Request object to implement
the things we need.  This should make it easier to build delegate
request objects because the API is smaller

#where fails if opts.responds_to?(:==) unexpectedly

Sometimes opts passed in might respond to ==, e.g. `Arel::Nodes::Grouping`. In this case, `opts == :chain` returns `Arel::Nodes::Equality` which causes odd behaviour. Prefer `if :chain == opts` which guarantees that `Symbol#==` would be invoked. Alternatively consider `eql?`.

Due to e25fdad2, we are correctly using
path escaping for email addresses.  This commit fixes the tests to
expect path escaping.

Escaping and unescaping paths is different than query parameters, and we
need to respect that.  This commit uses the new method in Rack to escape
and unescape paths.  Fixes #11816

Add detailed error message to `IrreversibleMigration`

fix module name typo in API app guide [ci skip]

Update Unicode Version to 8.0.0

Remove unnecessary require in associations_test.rb

Removed unused config from activemodel test

[ci skip] Added localhost IPv6

add a description of the return value that was missing [ci skip]

Since the strings are dynamically computed from a constant, the actual
strings we're creating are a known set. We can compute them ahead of
time, and reduce the number of allocations in that method.

[ci skip] Add description about which object

Commit bff61ba2, while reducing allocations, caused a regression when an empty
format is passed to a route.

This can happen in cases where you're using an anchor tag, for example:
`https://example.com/parent/575256966.#child_1032289285`.

Because of this change `format` was getting sent in
`parameterized_parts` when previously it was not included. This resulted
in blank `format`'s being returned as `.` when if there was an extension
included it would be `.extension`. Since there was no extension this
caused incorrect URL's.

The test shows this would result in `/posts/show/1.` instead of
`/posts/show/1` which causes bad urls since the format is not present.

`ActiveSupport::Notifications.subscribe` expects as second parameter.

fix invalid package name for libmysqlclient-dev mentioned in development_dependencies_install guide

tested on Ubuntu Desktop 15.04

Typo on helper description and action_controller_overview

typo "description not clear corrected with proper description and action_controller_overview file Rails' ->  Rails" [ci skip]

Remove not used requires

[Rafael Mendonça França + Jean Boussier]

Include MIT-LICENSE in railties gem

Fix: make Travis CI happy about guides again