Refactors Newsletters as per @badshark's comments

lib/Newsletter/Renderer/StylesHelper.php

@@ -0,0 +1,40 @@
+<?php namespace MailPoet\Newsletter\Renderer;
+
+class StylesHelper {
+
+  public $cssAtributesTable = array(
+    'backgroundColor' => 'background-color',
+    'fontColor' => 'color',
+    'fontFamily' => 'font-family',
+    'textDecoration' => 'text-decoration',
+    'textAlign' => 'text-align',
+    'fontSize' => 'font-size',
+    'borderWidth' => 'border-width',
+    'borderStyle' => 'border-style',
+    'borderColor' => 'border-color',
+    'borderRadius' => 'border-radius',
+    'lineHeight' => 'line-height'
+  );
+
+  function getBlockStyles($element, $ignore = false) {
+    if(!isset($element['styles']['block'])) {
+      return;
+    }
+
+    return $this->getStyles($element['styles'], 'block', $ignore);
+  }
+
+  function getStyles($data, $type, $ignore = false) {
+    array_map(function ($attribute, $style) use (&$styles, $ignore) {
+      if(!$ignore || !in_array($attribute, $ignore)) {
+        $styles .= $this->translateCSSAttribute($attribute) . ': ' . $style . ' !important;';
+      }
+    }, array_keys($data[$type]), $data[$type]);
+
+    return $styles;
+  }
+
+  function translateCSSAttribute($attribute) {
+    return (array_key_exists($attribute, $this->cssAtributesTable)) ? $this->cssAtributesTable[$attribute] : $attribute;
+  }
+}