refactor: extract function check_made_by
tests for made_by_roxygen and made_by
empty files are not treated as autogenerated
Merge pull request #197 from krlmlr/empty-file

Empty files are not treated as autogenerated
Pass both blocks and env into roclets
Deprecate @S3method. Closes #198
Upgrading notes in news
Massive refactoring of object creation
Don't store object name, computed when needed
Initial minidesc scaffolding
First stab at formatting
Capture generic for class combinations
Start preparing for describeIn switch
Implement and test describeIn
Mention @describeIn in NEWS. Closes #185.
Re-document
New do repeat yourself section
Organise and proof news
Add function to make upgrade easier
Use non-conflicting name