Added leftovers token to sort-order option, fixes #160.
New option: sort-order-fallback

Support fallback to alphabetical sort order for uknown properties.
Gonzales 3.0: Update package version
Gonzales 3.0: Update options for colon spaces

Update `space-before-colon` and `space-after-colon` options to make them work
with Gonzales 3.0
Gonzales 3.0: Update `vendor-prefix-align`

- Rename `decl` to `property` in all method names.
- Find `value` node without assuming that it is always `node[3]`.
Gonzales 3.0: Update `sort-order`

Separate different groups of comments:
- `sc0` -> spaces and comments before declaration;
- `sc1` -> spaces and comments between declaration and declaration delimiter;
- `sc2` -> spaces and comments after declaration delimiter.