Update version number and major revisions to "Why SALVE?"

Radical simplification of "Why SALVE?" in README, removed a lot of content.
Added examples for variable and relative path expansion.
Includes some other minor edits and added thanks to top section.
Added backup and common attributes to README.

These were a needed addition after the backup feature was added.
Addition of Notes and Thanks at end of README
Merge branch 'documentation/readme-1.0.0' into dev