アカウント名を取得できるようにした
Tumblelog#post_count ポスト数
fix spec context
each_post_rangedを削除しeach_postにまとめた
全postのidのテストを追加
wrote require and spec for resumable_tumblelog
add pry-rescue gem in development
ref spec
refactor and add case
wrote resumable_tumblelog (works wrong)
To save next_count to State, and fix bug
improve spec