Add pear modules, mail and net_smtp via composer (#93)

Add pear modules, mail and net_smtp via composer, remove php 5.6 build due to phpunit 6

lib/composer/vendor/consolidation/log/composer.json

@@ -21,15 +21,22 @@
     "require": {
         "php": ">=5.5.0",
         "psr/log": "~1.0",
-        "symfony/console": "~2.5|~3.0"
+        "symfony/console": "^2.8|^3|^4"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*",
+        "satooshi/php-coveralls": "dev-master",
         "squizlabs/php_codesniffer": "2.*"
     },
+    "minimum-stability": "stable",
     "extra": {
         "branch-alias": {
             "dev-master": "1.x-dev"
         }
+    },
+    "config": {
+        "platform": {
+            "php": "5.6"
+        }
     }
 }