fix texture paths and parse texture map options

When the mtl has statements like ```map_Bump -bm 0.2 ./foo.jpg``` then
the options end up in the texture path.
eg: ```./-bm 0.2/foo.jpg```.

This commit fixes the path and parses the options.

lib/loadMtl.js

@@ -195,10 +195,52 @@ loadMtl._createMaterial = function(materialOptions, options) {
     return convertMaterial(combine(materialOptions, new Material()), options);
 };
 
+/**
+ * Parses texture map options like -o, -s, -bm which end up in the texturePath
+ *
+ * @param {String} texturePath The original texture path
+ * @param {Object} textureOptions This object will be filled with the options
+ *
+ * @return {String} The fixed texturePath or undefined when there's no texture options
+ */
+function parseMapOptions (texturePath, textureOptions) {
+
+  if (!/-(bm|t|s|o|blendu|blendv|boost|mm|texres|clamp|imfchan|type)\s+/.test(texturePath)) {
+    return;
+  }
+
+  var pathParts = texturePath.split(/[\\\/]/);
+
+  if (pathParts.length && pathParts.length > 2) {
+    var mapOptions = pathParts[pathParts.length - 2].split(/\s+/);
+    var currPart = null;
+
+    mapOptions.reduce(function (p, part) {
+      if (/-/.test(part)) {
+        currPart = part;
+        p[part] = [];
+      } else if (currPart) {
+        p[currPart].push(part);
+      }
+      return p;
+    }, textureOptions);
+
+    pathParts.splice(pathParts.length - 2, 1);
+    return path.join.apply(null, pathParts);
+  }
+}
+
 function loadMaterialTexture(material, name, texturePath, textureOptions, mtlDirectory, texturePromiseMap, texturePromises, options) {
     if (!defined(texturePath)) {
         return;
     }
+
+    var mapOptions = {};
+    var newTexturePath = parseMapOptions(texturePath, mapOptions);
+    // TODO: handle texture options
+    // NOTE: this might not be a good place to do this
+    texturePath = newTexturePath ? newTexturePath : texturePath;
+
     var texturePromise = texturePromiseMap[texturePath];
     if (!defined(texturePromise)) {
         if (options.secure && outsideDirectory(texturePath, mtlDirectory)) {