For #21 - Replace non-breaking space (and other space characters) wit…

…h normal space if not present in font.

Thanks @rototor

README.md

@@ -262,6 +262,7 @@ CHANGELOG
 
 head - 0.0.1-RC3-SNAPSHOT
 ========
++ [Replaced non-breaking spaces - and other unusual spaces - with normal space if font does not support them](https://github.com/danfickle/openhtmltopdf/issues/21) Thanks @rototor
 + [Added a method for adding a PDF font using an input stream](https://github.com/danfickle/openhtmltopdf/issues/20) Thanks @aleksandr-m
 + [Added support for plugging in an external URI resolver](https://github.com/danfickle/openhtmltopdf/issues/18)
 + [Added support for plugging in an external cache](https://github.com/danfickle/openhtmltopdf/issues/18)

openhtmltopdf-pdfbox/src/main/java/com/openhtmltopdf/pdfboxout/PdfBoxOutputDevice.java

@@ -451,7 +451,12 @@ else if (replace.fontDescription != current.des) {
                     sb = new StringBuilder();
                 }
 
-                sb.append(replace.replacement);
+                if (Character.isSpaceChar(unicode)) {
+                    sb.append(' ');
+                }
+                else {
+                    sb.append(replace.replacement);
+                }
             }
         }