How to add our files to an upstream release

First remove execution bits from upstream release files.

Git settings

1. .gitattributes
2. .gitignore

Tests

1. .travis.yml
2. phpunit.xml.dist
3. tests/
4. bin/

Composer

1. composer.json

GitHub templates

1. ISSUE_TEMPLATE.md
2. PULL_REQUEST_TEMPLATE.md

Text files

1. README.md
2. LICENSE
3. Add changes in readme.txt, not in the old changelog.txt
4. Our w3-total-cache.php with the new version

File list

bin/install-wp-tests.sh
composer.json
.gitattributes
.gitignore
ISSUE_TEMPLATE.md
LICENSE
phpunit.xml.dist
PULL_REQUEST_TEMPLATE.md
README.md
tests/test-object-cache-memcache.php
tests/test-object-cache-apcu.php
tests/w3-object-cache-test.php
tests/test-object-cache-redis.php
tests/bootstrap.php
tests/test-object-cache-apc.php
tests/test-object-cache-file.php
.travis.yml