Updated God gem from 0.13.2 to 0.13.3
Added angularjs infinite scroll javascript from http://binarymuse.github.io/ngInfiniteScroll
WIP: implement infinite scrolling of entries.
Added Kaminari gem for activerecord results pagination.

For more about Kaminari see:

  https://github.com/amatsuda/kaminari
WIP: support pagination of the entries returned by FeedsController#show action.
WIP: pagination of entries returned by the server.
Added acceptance tests for retrieving all entries from a feed (read and unread) paginated.
Fixed unit test.
Added unit tests for paginated retrieval of entries from a User instance.
User#refresh_feed no longer returns the list of entries. It will raise a NotSubscribedError if it is passed a feed to which the user is not subscribed.

This means application logic must change; when requesting a feed refresh, after receiving the "OK" response the client will have to request its entries, the same as if the user clicked on a feed to read its entries. This simplifies pagination: pagination logic can be onl associated with entries retrieval, not with feed refreshing.
FeedsController#update no longer returns the updated list of entries, just a status header. The angularjs service, after receiving an OK response to the refresh request, issues a GET request to retrieve the list of entries via FeedsController#show.

This simplifies design: we only have to worry about pagination in FeedsController#show (well and in FoldersController#show, but that's not yet implemented).
Minor code reorganization to invoke pagination on the same line of code that retrieves results from the database, when retrieving feed entries.

I'm not sure if Kaminari gem does any optimization this way, but I really hope so.
WIP: pagination of entries list.
WIP: infinite scroll of entries.
WIP: infinite scroll of entries.
WIP: infinte scroll of entries.
Arguments to the read_entries_page angularjs function are redundant.
Moved management of boolean flags related to entries pagination to a separate angularjs service. Removed obsolete function from angularjs service.
Fixed "read all entries" functionality.
When reading a whole folder, client-side pagination is implemented. The servers's response pagination is not yet implemented.