Amebloader: Ameba blog downloader

Ameba blog downloader.

./amebloader.sh <blog URL>

* It downloads all contents under 'data' directory, like
   data/2014/01/12345678/{entry*.html,image*.html,t*.jpg,o*.jpg}.

* blog URL should be without trailing slash.

* original jpeg files (o*.jpg) will be retrieved.

* <a href> links to image*.html in entry*.html files will be replaced
  with links to original jpeg files. Thumbnails (t*.jpg) are still
  kept, so you can browse entry*.html file by a browser.

* If the entry has already been downloaded, 'download_completed' file
  will be created, which makes next download skipped.

* Links in archiveentrylist*.html are not converted to this directory
  hierarchy so you cannot navigate archiveentrylist*.html.