AS::Callbacks: rip out per_key option.

AS::Callbacks#define_callbacks: add :terminate_after_callbacks option

AC::Callbacks: remove usage of :per_key option from filters

Added note about new Unicode version.

Update Unicode database to recently-released 6.1.

http://www.geek.com/articles/geek-pick/unicode-6-1-released-complete-with-emoji-characters-and-a-pile-of-poo-2012022/

Verbose output for tests.

See #3892

Add convenience method to hide a generator from the available ones

It is usually useful to be able to hide a generator when running rails
generate command. Such generators might be used only to dry up
generators code and shouldn't be available to end users.

Allow store to be a not null column.

columns method doesn't have name argument

Collection radio buttons / check boxes helpers

Remove useless argument in #columns.

collection_radio_buttons

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

And options_from_collection_for_select as well.

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

This will make it easy for the user to handle how check box/radio and
labels should be generated, abstracting any text/value/default html
options required to make it work.

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

* Extract value sanitization from default name and id method and new
  collection helpers;
* No need to sanitize value in default name and id always;
* Improve value_before_type_cast to avoid concating the same method name
  string twice.

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

collection_radio_buttons

[Carlos Antonio da Silva + Rafael Mendonça França]