Rework prompting in config and config:deploy tasks

Deprecates config:all task. Renames @@force to @@overwrite_all. Makes
task descriptions more consistent.
Bump version to 0.7.
Update README to match recent changes

Also shortens examples and references documentation on the Relish site
instead.
Fix typo in feature filename
Add .nav file for Relish documentation

This specifies the order that features are displayed in the Relish
table of contents.
Merge pull request #59 from mdsol/feature/make_prompt_behavior_predictable

Make prompt behavior predictable