Fix about the dates of reading-vimplugin
Improve _data/next.yml

Support part, hash, and to list future informations.
Add aim to the yaml info
Modify to include template archive.md
Improve template archive.md: Do not show relevant links if they aren't exist
Rename jekyll_serve script and use sh instead of bash
Add update script
Add part & other on _data/archives.yml
Improve template of part section and add other section

If there are more than one plugins to read, part dose nothing
Improve _data/next.yml
Merge branch 'improve/update' into gh-pages #1