Fix build error

I get the following error when I use ShareKit from CocoaPods:

/Users/stephend/Documents/Development/iPhone/Code/App/Pods/ShareKit/Classes/ShareKit/UI/SHKFormFieldLargeTextSettings.m:12:9: fatal error: 'UIImageView+UIActivityIndicatorForSDWebImage.h' file not found
#import "UIImageView+UIActivityIndicatorForSDWebImage.h"
        ^
1 error generated.

The attached patch adds the appropriate packages so that SDWebImage and a category get installed correctly.