Allowing long names to break in the cv title again (#221)

* allow long names in titles to break

Until now, a `~` (non breaking space) connects first
and last name in the cv title. This prevents long
names to break correctly. This commit replaces the space
with `\ `, a space that allows breaking.

Fixes #220

* added changelog entry

* removed non-breaking space in names from other headlines, too

moderncvheadiv.sty

@@ -93,7 +93,7 @@
     {\setlength{\makecvheadnamewidth}{\textwidth-\makecvheadpicturewidth}}%
     {}%
   \begin{minipage}[b]{\makecvheadnamewidth}%
-    \firstnamestyle{\@firstname~}\lastnamestyle{\@lastname}%
+    \firstnamestyle{\@firstname\ }\lastnamestyle{\@lastname}%
     \ifthenelse{\equal{\@title}{}}{}{\\[1.25em]\titlestyle{\@title}}%
   \end{minipage}%
   % optional photo