Make sure paths with spaces are treated correctly.

Fixes the issue of endlessly looping with project directory paths like "/my/project/this & that"

apache-maven/src/bin/mvn

@@ -200,7 +200,7 @@ find_maven_basedir() {
   local basedir=$(pwd)
   local wdir=$(pwd)
   while [ "$wdir" != '/' ] ; do
-    wdir=$(cd $wdir/..; pwd)
+    wdir=$(cd "$wdir/.."; pwd)
     if [ -d "$wdir"/.mvn ] ; then
       basedir=$wdir
       break