Merge pull request #304 from facebook/logging

Implemented logging structure

Author: everton-rosario

README.md

@@ -82,7 +82,7 @@ If you are encountering problems, the following tips may help in troubleshooting
 
 - If content is missing from your transformed article, more likely than not there isn't a **Transformer Rule** matching an element in your source markup. See how to configure appropriate rules for your content in the [Transformer Rules documentation](https://developers.facebook.com/docs/instant-articles/sdk/transformer-rules).
 
-- Set the `threshold` in the [configuration of the Logger](https://logging.apache.org/log4php/docs/configuration.html#PHP) to `DEBUG` to expose more details about the items processed by the Transformer.
+- Set the `threshold` in the transformer Logger level to `DEBUG` to expose more details about the items processed by the Transformer. `TransformerLog::setLevel(TransformerLog::DEBUG);`
 
 - Refer to the existing [tests of the `Elements`](https://github.com/facebook/facebook-instant-articles-sdk-php/tree/master/tests/Facebook/InstantArticles/Elements) for examples of what is required of each and to potentially create your own tests (which can be run with `$ composer test`).
 

composer.json

@@ -11,13 +11,14 @@
     }],
     "require": {
         "php": "^5.4 || ^7.0",
-        "symfony/css-selector": "2.8.* || ^3.0",
-        "facebook/graph-sdk": "~5.0",
-        "apache/log4php": "2.3.0"
+        "symfony/css-selector": "2.8.*",
+        "facebook/graph-sdk": "~5.0"
     },
     "require-dev": {
         "fzaninotto/faker": "^1.6.0",
-        "phpunit/phpunit": "^4.8.36",
+        "phpunit/phpunit": "4.8.*",
+        "symfony/yaml": "2.1.*",
+        "phpdocumentor/reflection-docblock": "^2.0",
         "squizlabs/php_codesniffer": "^2.6.0"
     },
     "autoload": {