rake -> bin/rake

Added description in actionview gemspec.

Typo fix [ci skip]

change function def self.table_name to self.table_name

change def self.primary_key to self.primary_key

change def self.primary_key to self.primary_key

[skip ci] Fixing the typo which is formed a not required link.  Check here http://api.rubyonrails.org/classes/ActionController/Base.html  under paramters section
keeping it under tt tag

* we no more have to manipulate the each caller strings by ourselves using caller_locations

* caller_locations runs slightly faster, and creates less objects than good old caller
Benchmark (loading an Engine 1000 times):
  caller: 262.89 ms
  caller_locations: 186.068 ms

Allow REMOTE_ADDR, HTTP_HOST and HTTP_USER_AGENT to be overridden from
the environment passed into `ActionDispatch::TestRequest.new`.

Fixes #11590

Cleanup task for informing about hstore

ActionMailer Guide: Should be "different formats".

don't convert mailer default values to procs

Simplify select_one method.

text_area should handle nil value option like text_field

The select_all method always returns ActiveRecord::Result instance,
and the ActiveRecord::Result includes Enumerable mixin.
If #empty?, #first method returns nil. Thus we can simplify this method.

Fix secure_password password_confirmation validations

Move model mutation to the methods that are called on the model.

add the missing middleware in command line guides rake about [ci skip]

assert_file already gives this functionality for free by passing
multiple contents.