use phantomJS paperSize margin property in place of border

margin replaced border six years ago in phantomJS, although
backward compatibility still allows the border property
to function correctly.

This change updates html-pdf to use the margin property and
to continue recognizing the border property for backward
compatitiblity.

fixes: marcbachmann#403
refs: ariya/phantomjs@a638a07

Author: TomCoded

README.md

@@ -93,9 +93,9 @@ config = {
   "orientation": "portrait", // portrait or landscape
 
   // Page options
-  "border": "0",             // default is 0, units: mm, cm, in, px
+  "margin": "0",             // default is 0, units: mm, cm, in, px
   - or -
-  "border": {
+  "margin": {
     "top": "2in",            // default is 0, units: mm, cm, in, px
     "right": "1in",
     "bottom": "2in",

lib/pdf.js

@@ -32,6 +32,8 @@ function PDF (html, options) {
     this.script = path.join(__dirname, 'scripts', 'pdf_a4_portrait.js')
   }
 
+  if (this.options.border && !this.options.margin) this.options.margin = this.options.border;
+    
   if (this.options.filename) this.options.filename = path.resolve(this.options.filename)
   if (!this.options.phantomPath) this.options.phantomPath = phantomjs && phantomjs.path
   this.options.phantomArgs = this.options.phantomArgs || []

lib/scripts/pdf_a4_portrait.js

@@ -192,7 +192,7 @@ function createSection (section, content, options) {
 // Creates paper with specified options
 // ------------------------------------
 function definePaperOrientation (options) {
-  var paper = {border: options.border || '0'}
+  var paper = {margin: options.margin || '0'}
 
   if (options.height && options.width) {
     paper.width = options.width