Some condensation

- Condensed a little bit more the text and snippets 
    - Only to illustrate how the path changes
    - Removed `sass()` and watcher function, only `src` and `dest`
- Removed the first snipped since the first one suffices to explain what happens with the base and relative path.
- Removed the mention to the `callback` 
- Split the code snippets for two cases: 
   - Be explicit about the base 
   - Don't change the base but write a different destination folder
an error

Ups
is an option, so there it belongs
Simpler is better
Merge branch 'patch-1' of https://github.com/stringparser/gulp into stringparser-patch-1

Conflicts:
	docs/API.md
Merge branch 'stringparser-patch-1'