[Coredata]几个接口：

- (BOOL)setNameByItem:(NSString*)fromName
               toName:(NSString*)itemName;

- (BOOL)setColorByItem:(TimingItem *)item
               toColor:(int)color;

- (BOOL)setTagByItem:(TimingItem*)item
             withTag:(NSString*)tagName;

- (Tag* )getTagByItem:(NSString*)itemName;
Merge branch 'master' of https://github.com/TimePie/TimePie