jp (blog/edit): added metadata handling through a .json file (named like content temporary file, but with extension replaced by "_metadata.json"). Modification to this file before the end of edition will be taken into account.

syntax: glob
*.pyc
*.pyv
*.swp
*.swo
tags
twistd.log
twistd.pid
bridge_constructor/generated
_trial_temp/
sat.egg-info
*.un~
dist
MANIFEST
build
ctags_links/
Session.vim