照片可以scroll了～
Merge remote-tracking branch 'origin/master' into AddPhotoInReceiptUsingUIScrollView
scrollViewBranch merge from masterBranch

pull的時候沒切回master.....
Revert "scrollViewBranch merge from masterBranch"

This reverts commit 14342503ae35fbb4a00650c85d221100619724fa.
Revert "Merge remote-tracking branch 'origin/master' into AddPhotoInReceiptUsingUIScrollView"

This reverts commit c03cad0806fc43bab2e736a3183fca9029da9d00, reversing
changes made to 6f796f4eb45f936cfe20259e3c9eeef511d2659e.
addReceipt的save method，在儲存Receipt後會儲存加入的照片～（目前存在：/Users/YICHUN/Library/Application Support/iPhone Simulator/7.1-64/Applications/59B586E4-2F06-47EB-BB72-2249CF894FA6/Documents/Potos/Trip  LA裡，檔名為時間msec）
receiptDetail也可以看到存入的照片。（save功能還沒做）
categories會顯示預先設定的顏色。
Category顯示分類圖片與顏色（還沒修改receiptDetail顯示照片的順序）
可以存多的照片（但還不能刪）
Merge branch 'master' into AddPhotoInReceiptUsingUIScrollView
merge後可以run的版本（尚未完全確認，有部分功能待查）
Receipt的新增儲存照片功能都測過，ＯＫ！
add group bug
Group Detail total OK