^^^^^^^^^^^^^^^^^^
* Change API path /v1 to /api
* Change behavior of Category API
* Change behavior of Tag API
* Added FeedSubscription and CralingHistory models
* Added API of FeedSubscription
* Added view of subscribed feeds list and manage view
* Added register bookmarks from subscribed feeds
* Added feed parser and register of bookmark from subscribed feed by celery
* Added list display at Django admin
* Using fake name generator for test
* Change using fixtures for User, Category, Tag