Corrections & news

- a specific help string for each action
- a new action "extract" to extract from files contents
- a new management of action allowing to write
"path/to/not-referenced/action.sh"
- a new way of naming configuration variables
New expanded README
New README infos
Merge branch 'master' into wip

Conflicts:
	dev/changelog.sh
Oups
Renaming "deploy" to "dev-tools", it's real name
Corrections in the action usage (we now use default BashLib stuff)
Work-in-progress commit
Adding the pre-tag-hook feature
Updating bash library
Full infos cleaning
Merge branch 'wip'
No "dev/" stuff in master
Adding "composer.lock" to the gitignore and cleaning composer.json