Minor changes

* fixed "iCloud://Documents/Documents" issue
Removed useless "PhotoPickerViewController" & fixed some filters issues

* photo-picking functionality moved to master controller
* limited filters count to most usable
* fixed filters duplication on filter-table reload

Also:
* fixed some view backgrounds
* fixed unbound detail text view in details-view-controller
Changed text indentation in project settings
Implementing "iCloudSynchronization" preference
Added ShareKit
Suppress "undefined selector" warning in UIApplication+SSToolkitAdditions.m

MSPrivateAdditions (UIApplication+SSToolkitAdditions.m) category moved
upper in code to suppress "undefined selector" warning
Implemented "Share" functionality

+ configured test credentials for Twitter
* minor UI changes for iOS 7 compatibility
Merge branch 'feature-socials' into develop
Minor UI/behavior changes

* fixed some UI issues for StringPreferenceCell and SwitchPreferenceCell
* fixed keyboard behavior for StringPreferenceCell