Fixes #5 create_uuid, test_create_category.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Closes #7 Using Travis-ci.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Merge pull request #9 from mkouhei/fixed_create_category

Fixes #5 and #7