upgrade php unit to 4.8 version (latest 4.x), upgrade php-coveralls to latest version

Author: Gemorroj

composer.json

@@ -17,8 +17,8 @@
         "paragonie/random_compat": "~1.4|~2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.5.*",
-        "satooshi/php-coveralls": "1.0",
+        "phpunit/phpunit": "^4.8.35",
+        "php-coveralls/php-coveralls": "2.1",
         "codeless/jugglecode": "1.0"
     },
     "autoload": {

phpunit.xml.dist

@@ -1,4 +1,7 @@
-<phpunit backupGlobals="true"
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.8/phpunit.xsd"
+         backupGlobals="true"
          backupStaticAttributes="true"
          colors="true"
          convertErrorsToExceptions="true"