v0.2.0

• change: existing versions of generators are renamed, not overwritten
• removed: hygen generate --force option (has become unnecessary due to auto-rename of previous version)
• change: if HYGEN_CREATE_TMPLS is not set, will look for template directory using HYGEN_TMPLS, then in ./_templates
• add: option to specify whether generator will create a parent dir (hygen-create setopt --gen-parent-dir|--no-parent-dir)
• change: the created generator will not include a parent dir by default
• fix: HYGEN_CREATE_TMPLS can be relative