Added FeedSubscription and CralingHistory models.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Change using fixtures for User, Category, Tag.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Fixed append generate_data.py and execute in tox.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Add API of FeedSubscription.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Merge pull request #20 from mkouhei/adding_feedparser

Adding feedparser