Remove AWS v1 support

TODO: Simpify lib/paperclip/storage/s3.rb

See:

* https://github.com/thoughtbot/paperclip/issues/2049

.travis.yml

@@ -8,7 +8,6 @@ script: "bundle exec rake clean spec cucumber"
 gemfile:
   - gemfiles/4.2.awsv2.1.gemfile
   - gemfiles/4.2.awsv2.0.gemfile
-  - gemfiles/4.2.awsv1.gemfile
 
 sudo: false
 cache: bundler

Appraisals

@@ -7,8 +7,3 @@ appraise "4.2.awsv2.0" do
   gem "rails", "~> 4.2.0"
   gem "aws-sdk", "~> 2.0.0"
 end
-
-appraise "4.2.awsv1" do
-  gem "rails", "~> 4.2.0"
-  gem "aws-sdk", "~> 1.5"
-end

README.md

@@ -561,7 +561,7 @@ Storage
 Paperclip ships with 3 storage adapters:
 
 * File Storage
-* S3 Storage (via `aws-sdk` or `aws-sdk-v1`)
+* S3 Storage (via `aws-sdk`)
 * Fog Storage
 
 If you would like to use Paperclip with another storage, you can install these
@@ -591,10 +591,6 @@ the `aws-sdk` gem in your Gemfile:
 ```ruby
 gem 'aws-sdk', '>= 2.0.0' # If using paperclip `master` (upcoming v5.0)
 ```
-or
-```ruby
-gem 'aws-sdk-v1' # If using paperclip <= v4.3.1
-```
 
 And then you can specify using S3 from `has_attached_file`.
 You can find more information about configuring and using S3 storage in

gemfiles/4.2.awsv1.gemfile

-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "sqlite3", "~> 1.3.8", platforms: :ruby
-gem "pry"
-gem "rails", "~> 4.2.0"
-gem "aws-sdk", "~> 1.5"
-
-group :development, :test do
-  gem "activerecord-import"
-  gem "mime-types", "~> 1.16"
-  gem "builder"
-  gem "rubocop", :require => false
-end
-
-gemspec path: "../"