Merge branch 'release/1.1.0' into develop
Add release checklist.
Add gitignore.
Add step to rename package file.
Added `git push --tags` to release checklist.
Updated date parsing to specifically look for 3-, 2-, or 1-digit dates.

Fixes #45
Updated date normalization to handle dates BCE.

This is related to #45.
Updated README with more information about date formats.
Merge branch 'feature/short-date-fix' into develop.

This was for #45.
Set version to 1.1.1.
Added missing steps to release checklist.
Updated translations.
Merge branch 'release/1.1.1'