Add formatting libraries to composer.json

vendor/leafo/lessphp/tests/README.md

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+lessphp uses [phpunit](https://github.com/sebastianbergmann/phpunit/) for its tests
+
+* `InputTest.php` iterates through all the less files in `inputs/`, compiles
+  them, then compares the result with the respective file in `outputs/`.
+
+* `ApiTest.php` tests the behavior of lessphp's public API methods.
+
+* `ErrorHandlingTest.php` tests that lessphp throws appropriate errors when
+  given invalid LESS as input.
+
+From the root you can run `make` to run all the tests.
+
+## lessjs tests
+
+Tests found in `inputs_lessjs` are extracted directly from
+[less.js](https://github.com/less/less.js). The following license applies to
+those tests: https://github.com/less/less.js/blob/master/LICENSE
+
+## bootstrap.sh
+
+Clones twitter bootsrap, compiles it with lessc and lessphp, cleans up results
+with sort.php, and outputs diff. To run it, you need to have git and lessc
+installed.
+