do not care about the version of rubygems (issue #649)
bump version to 2.0.1
forgot to commit the Gemfile.lock
forget to add the migrations in the gem (issue #651)
fix issue #652
fix issue #641
fix issue #652 (Need to specify order explicitly)
fix issue #656
better exception handling mechanism for the API
typo: 500 instead of 505
Merge pull request #657 from dimonzozo/v2.0.x

fix issue #652 (Need to specify order explicitly), #656
write a small test to confirm the fix #656
bump version to 2.0.2
Fix typo.
Adding translations.
Translate to Japanese.
Merge pull request #663 from xxxcaqui/master

Translate to Japanese
Merge pull request #661 from RamonPage/translations

Translations
fix issue #658
fix issue #662