Composer improvements

• Remove composer cache from the end image
• Copy the composer executable from the official composer image

PHP 7.2

• Update docker images to PHP 7.2
• Update phpstan to 0.9.1
• Update phan links since it was moved to a new organisation

Phan & phpstan update

• Update phan 0.10.1 -> 0.11.0
• Update phpstan 0.8.5 -> 0.9

Include EasyCodingStandard

Changes:

• #16 Update Phan to 0.10.1 (thanks to @BenExile)
• #16 Update PhpStan to 0.8.5 (thanks to @BenExile)

New tools:

• #15 ecs - EasyCodingStandard sets up and runs coding standard checks with 0-knowledge of PHP-CS-Fixer and PHP_CodeSniffer (thanks to @ostrolucky)

PhpMetrics update

• Update PhpMetrics to v2.3.2 (thanks to @BenExile)
• Point to the contribution guidelines in the pull request template

Include phpcov

New tools:

• phpcov - a command-line frontend for the PHP_CodeCoverage library (thanks to @gimler)

Tools update & testing

• Update phan to 0.10.0 (thanks to @BenExile)
• Update PhpMetrics to 2.3.0 (thanks to @BenExile)
• Update phpstan to 0.8.4 (thanks to @BenExile)
• Generate installation commands from a json list of tools
• Test if tools can actually be run on the CI

Include the security-checker

Changes:

• install a specific version of php-cs-fixer - 2.6.0 (thanks to @grachevko)

New tools:

• security-checker - Checks composer dependencies for known security vulnerabilities (thanks to @madnight)

Include churn

• Suggest creating an alias in the README.

Include:

• churn - Discovers good candidates for refactoring

PhpStan and Phan update

• update phpstan to 0.8.3
• update phan to 0.9.4