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options.import can be a function to be able to set @import statement according to a file path
Merge pull request #14 from gymglish/develop

options.import can be a function to be able to set @import statement according to a file path
Refactor less import keyword callback changes.

- Keep previous structure of option defaults
- Pass extension of current file, it's useful and free
- Error if callback does not return string
- Yoda conditions
Update test

- Change file paths
- Change test wording
- Callback must return string
Update docs
Update dev deps
1.1.0