Ignore MANIEFST
Add long_description to setup.
Merge pull request #6 from KLab/cleanup

MANIFEST削除とlong_description追加
update version
fix 'No such file:README.rst' for tox
add label validation
Make tox to pass.
Merge pull request #7 from KLab/fix-tox

Make tox to pass.
modify for travis-ci
test of travis-ci changes to tox
add travis-ci status image
Ignore .tox directory.