fix(nbsp): nbsp are replaced with simple spaces

dist/showdown.js

@@ -978,6 +978,9 @@ showdown.Converter = function (converterOptions) {
     text = text.replace(/\r\n/g, '\n'); // DOS to Unix
     text = text.replace(/\r/g, '\n'); // Mac to Unix
 
+    // Stardardize line spaces (nbsp causes trouble in older browsers and some regex flavors)
+    text = text.replace(/\u00A0/g, ' ');
+
     if (options.smartIndentationFix) {
       text = rTrimInputText(text);
     }

src/converter.js

@@ -268,6 +268,9 @@ showdown.Converter = function (converterOptions) {
     text = text.replace(/\r\n/g, '\n'); // DOS to Unix
     text = text.replace(/\r/g, '\n'); // Mac to Unix
 
+    // Stardardize line spaces (nbsp causes trouble in older browsers and some regex flavors)
+    text = text.replace(/\u00A0/g, ' ');
+
     if (options.smartIndentationFix) {
       text = rTrimInputText(text);
     }