Fix for iOS8 UIActivityViewController Popover Presentation

Tapping the Action button in iPad on iOS will generate a crash. This is because UIActivityViewControllers are presented in a UIPopoverController in iOS8. So, they need to be anchored. Added code to access the popover to set the anchor point.

See: http://stackoverflow.com/questions/25644054/uiactivityviewcontroller-crashing-on-ios8-ipads
Updated SDWebImage and updated projects for Xcode 6

Fixes #299
Merge branch 'develop' of github.com:mwaterfall/MWPhotoBrowser
Merge pull request #300 from DeepFriedTwinkie/patch-1

Fix for iOS8 UIActivityViewController Popover Presentation on iPad
Updated podspec and bumped to 1.4.1

Closes #303
Merge pull request #4 from mwaterfall/master

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