Use proper name for zh-CN locale

Add explicit unlink to intermediate files from processors.

Also, add integration tests for custom processor definition and unit
test for Paperclip.load_processor (thoughtbot/paperclip#1535).

... instead of `lib` of `lib/paperclip_processors`.
Fixes thoughtbot/paperclip#1534

Remove duplicated attribute :whiny.

documentation.

They recommend sending a block to the #read method to avoid loading
large objects into memory. See:
http://docs.aws.amazon.com/AWSRubySDK/latest/AWS/S3/S3Object.html

 as the former is deprecated and throws a warning.

File.exists? has been deprecated since Ruby 1.9.2

Fixes #1520

This should make it possible to avoid passing a :geometry in the style
definition (when passing it as a hash), thus making Paperclip avoid resizing the
image. This is helpful when you want to perform your own custom
resizing/cropping using :convert_options rather than the default options offered
by Paperclip itself.

Fixes #1550

* Extract private methods
* Remove trailing conditionals
* Remove explicit returns
* Remove `.self`