Eval the commands in astronaut, fixing support for spaces in urls and such

astronaut/astronaut

@@ -107,7 +107,7 @@ download() {
         _msg "Downloading $filename"
 
         [ "$3" ] && local cmd="$3" || local cmd="$cmd_download"
-        $(echo "$cmd" | sed -e 's@{dst}@'"$path"'@g' -e 's@{src}@'"$1"'@g')
+        eval $(echo "$cmd" | sed -e "s@{dst}@'$path'@g" -e "s@{src}@'$1'@g")
 
         checksum="$(_mksum "$path")"
         if [ "$2" -a "$checksum" != "$2" ]; then
@@ -121,7 +121,7 @@ extract() {
     _msg "Extracting $1"
     [ "$2" ] && local dest="$2" || local dest="."
     [ "$3" ] && local cmd="$3" || local cmd="$cmd_extract"
-    $(echo "$cmd" | sed -e 's@{src}@'"$dir_source/$name/$1"'@g' -e 's@{dst}@'"$dest"'@g')
+    eval $(echo "$cmd" | sed -e "s@{src}@'$dir_source/$name/$1'@g" -e "s@{dst}@'$dest'@g")
 }
 
 getfile() {