Define 'metrics' binary in composer

 * Places a metrics binary in vendor/bin when added as a project dependency
 * Adds a user-friendly binary name (metrics vs metrics.php)
Drop short alias 'bin/metrics'
rules are updated
minor update in HTML report
Merge pull request #16 from alexdenvir:feature/define-binary-in-composer
Merge branch 'alexdenvir-feature/define-binary-in-composer'