Fixed Profile view extended with Backbone.View.

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

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Add feed subscriptions list and mange view.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>