Improved script tools.

- Allows posts to be placed in subdirectories (#41, #87).
- Identify posts file with the suffix ‘.markdown’.

**Page creator**
- Pass the posts without any categories or tags.
- Omit the YAML comments for categories/tags.

**Lastmod**
- compatible with one-digit month or day post files.

_scripts/sh/dump_lastmod.sh

@@ -74,14 +74,12 @@ main() {
 
   local _count=0
 
-  for _file in $(ls -r "$POST_DIR")
+  for _file in $(find ${POST_DIR} -type f \( -iname \*.md -o -iname \*.markdown \))
   do
-    _filepath="$POST_DIR/$_file"
-    _filename="${_file%.*}"     # jekyll cannot read the extension of a file, so omit it.
-    _filename=${_filename:11}   # remove the date
+    _filename=$(basename $_file | sed 's/[0-9]\([0-9]*-\)//g;s/\..*//' ) # remove date and extension
 
-    if _has_changed "$_filepath"; then
-      _dump "$_filename" "$_filepath"
+    if _has_changed "$_file"; then
+      _dump "$_filename" "$_file"
       ((_count=_count+1))
     fi