Use PSR-4 autoloading of existing classes; add remaining test files

.distignore

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+.DS_Store
+.git
+.gitignore
+.gitlab-ci.yml
+.editorconfig
+.travis.yml
+behat.yml
+circle.yml
+bin/
+features/
+utils/
+*.zip
+*.tar.gz

.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[{.jshintrc,*.json,*.yml,*.feature}]
+indent_style = space
+indent_size = 2
+
+[{*.txt,wp-config-sample.php}]
+end_of_line = crlf
+
+[composer.json]
+indent_style = space
+indent_size = 4

.travis.yml

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+sudo: false
+
+language: php
+
+notifications:
+  email:
+    on_success: never
+    on_failure: change
+
+branches:
+  only:
+    - master
+
+cache:
+  - composer
+  - $HOME/.composer/cache
+
+env:
+  global:
+    - PATH="$TRAVIS_BUILD_DIR/vendor/bin:$PATH"
+    - WP_CLI_BIN_DIR="$TRAVIS_BUILD_DIR/vendor/bin"
+
+matrix:
+  include:
+    - php: 7.1
+      env: WP_VERSION=latest
+    - php: 7.0
+      env: WP_VERSION=latest
+    - php: 5.6
+      env: WP_VERSION=latest
+    - php: 5.6
+      env: WP_VERSION=trunk
+    - php: 5.3
+      env: WP_VERSION=latest
+
+before_install:
+  - phpenv config-rm xdebug.ini
+
+install:
+  - composer require wp-cli/wp-cli:dev-master
+  - composer install
+  - bash bin/install-package-tests.sh
+
+before_script:
+  - composer validate
+
+script:
+  - behat --format progress --strict

LICENSE

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+The MIT License (MIT)
+
+Copyright (C) 2011-2017 WP-CLI Development Group (https://github.com/wp-cli/scaffold-command/contributors)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.