remove ruby 1.8 support code

Replaced all 'for' loops with Enumerable#each

Add 'image/pjpeg' format used by IE

http://msdn.microsoft.com/en-us/library/ms775147%28v=vs.85%29.aspx#_replace

tiny refactoring of date_helper

use :default option with translate method instead of condition
simplify separator method

Remove initialize variable columnn, not needed

remove autoload UrlWriter, no longer exists

Reverted build_original_fullpath method refactor

Reverted build_original_fullpath method, as per discussion at https://github.com/rails/rails/pull/4470/files#r393461

Remove not used env[] call in routing_test.

The commit 4c321c6d removes the path_params variable assignment, actually the entire line is not used at all.

This reverts commit abe915f2.

This broke all existing keys and it's wrong anyway. The array is just there as a convenience option for building the string. It's intentional that [ "stuff"] and "stuff" generates the same key.

Add create_join_table migration helper to create HABTM join tables

Removed unwanted intializer and replaced with ruby default collect method

Remove redundant instance variables (@colorize_logging)

Fix warning. assigned but unused variable - path_params

Fix documentation for has_secure_password

Fix regression from Rails 3.1

Same-level method visibility disappears into the syntax. Indent (and
outdent) emphasize the state change that accompanies the declaration.
All methods following 'private' are private: that's a natural
hierarchy worthy of visual reinforcement.

Outdent, represent!  :trollface:

Under Rails 3.1, you were allowed to pass a hash to a find_or_create
method with multiple attribute names, but this was broken as the
arguments were being improperly validated.

Do not generate label for attribute when giving nil

3.2 safe_constantize should handle wrong constant name NameErrors Fixes #4710