Updates Podfile dependencies
updates Helpshift pod to 4.5.0
Updates Pods
Removes Pods from User Header Search Paths
Fixes code referencing to AFNetworkingErrorDomain

AFNetworking’s AFNetworkingErrorDomain constant has been split into two
new strings:

- AFURLRequestSerializationErrorDomain
- AFURLResponseSerializationErrorDomain
Fixes EditPostViewController

WPEditorViewControllerDelegate’s editPostViewDismissed has been deleted.

This commit updates EditPostViewController, so it doesn’t rely on that
delegate just to signal compeltion.
Reverts Podfile change
Merge pull request #1864 from wordpress-mobile/issue/1845-update_Helpshift_framework

issue #1845 - update Helpshift framework
Remove all unreferenced files
Restore some icons and launch images
Remove unused activity image
Remove old sidebar code and images
Move all images to Images directory
Moved a few lingering images
Move all images to an Asset Catalog
Merge remote-tracking branch 'origin/develop' into issue/1861-upgrades-afnetworking

Conflicts:
	Pods/Pods.xcodeproj/project.pbxproj
Merge pull request #1865 from wordpress-mobile/issue/1861-upgrades-afnetworking

Issue/1861 Upgrades AFNetworking
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issue/1868-cleanup-images

Conflicts:
	WordPress/WordPress.xcodeproj/project.pbxproj
Merge pull request #1869 from wordpress-mobile/issue/1868-cleanup-images

Issue/1868 cleanup images
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/1729-layout-cleanup

Conflicts:
	WordPress/WordPress.xcodeproj/project.pbxproj