Revert "Use symlinks instead of copying files upon switch."

This reverts commit 0895ea3.

bin/n

@@ -138,11 +138,12 @@ install_node() {
   # activate
   local dir=$VERSIONS_DIR/$version
   if test -d $dir; then
-    # symlink everything, purge old copies or symlinks
-    for d in bin lib share include; do
-      rm -rf $N_PREFIX/$d
-      ln -s $dir/$d $N_PREFIX/$d
-    done
+    # TODO: refactor, this is lame
+    cd $dir \
+      && mkdir -p $N_PREFIX/lib/node \
+      && cp -fR $dir/include/node $N_PREFIX/include \
+      && cp -fR $dir/bin/* $N_PREFIX/bin \
+      && cp -fR $dir/lib/node/* $N_PREFIX/lib/node/ .
   # install
   else
     local tarball="node-v$version.tar.gz"