Use real server, won't fake paging locally now. Refs gradha/theranking-ios-candidates#7.
Updates query docs for paging. Refs gradha/theranking-ios-candidates#7.

Also removes photo detail info, we are not going to use it anyway.
Implements paging in network request. Refs gradha/theranking-ios-candidates#7.
Renames TRGridCell to TRGridPhotoCell. Refs gradha/theranking-ios-candidates#7.
Adds autoload cell without code. Refs gradha/theranking-ios-candidates#7.
Links autoload cell with paging requests. Refs gradha/theranking-ios-candidates#7.
Keeps track of page requests to avoid duplicates. Refs gradha/theranking-ios-candidates#7.
Merge branch 'feature/t7_icon_paging' into develop