Show config in a re-usable format

Config was outputted as: VAR=&lt;plain-string&gt;
This presents issues with multiline strings, for instance:
```
 ONE=something
 continued
 TWO=something not continued
```
This patch outputs this instead:
```
 ONE='something
 continued'
 TWO='something not continued'
```
The enclosing 's lets a parser know that the line is continued without needing to be hacky
If the config variable contains 's then the output is:
```
 ONE='something '\''extra'\''
 continued'
```
This allows easy bash re-use.

Also included are some simple additions to .gitignore.