Post-merge fix. Re-added auto-hiding of divider lines and added the same for the top and bottom lines.
Post-merge fix. Re-added auto-hiding of divider lines and added the same for the top and bottom lines.

jasperblues/PaperFold-for-iOS,honcheng/PaperFold-for-iOS,godLoveLucifer/PaperFold-for-iOS,jasperblues/PaperFold-for-iOS,AmitaiB/PaperFold-for-iOS,AmitaiB/PaperFold-for-iOS,Sweetymeow/PaperFold-for-iOS,gank0326/PaperFold,Sweetymeow/PaperFold-for-iOS,honcheng/PaperFold-for-iOS,gank0326/PaperFold,godLoveLucifer/PaperFold-for-iOS