Parent project update

- AlbumsFragment: changed retrieved photo cover size to 100dp instead of
100px.
- AlbumsFragment.AlbumsAdapter: added paging support to loadItems
- AlbumsResponse: overrode hasNextPage to return true if response has at
least one item
- ITroveboxApi: added getAlbums with paging parameter method variation
- PagedResponse: fixed ArrayIndexOutOfBounds exception when returning
result array has no items
- TroveboxApi: added getAlbums with paging method implementation
- TroveboxApi: extracted paging restriction functionality to the
addPagingRestriction method which is used in getPhotos and getAlbums
- res/values/dimens.xml: added album_item_size dimension constant