Provide interface to switch off XPC service usage based on service type
First draft of Facebook parser
Refactor access rights control to a broader mechanism (first stab)

This allows for integration of other access control mechanisms than file/folder entitlements
Remigrate to managing node reloading in access requester
Merge branch 'refs/heads/task-authentication' into facebook-parser

Conflicts:
	iMedia.xcodeproj/project.pbxproj (resolved by hand-picking)
First draft of PhFacebook integration
Refactor node accessibility: parser is now in charge
Merge branch 'refs/heads/task-authentication' into tryout-PHFacebook
Move to our own fork of PhFacebook submodule
PhFacebook: Let PhFacebook conform to NSCoding
PhFacebook: NSCoding additions
Various changes regarding Facebook integration

- limit Facebook node nesting to two levels (me and friends)
- add meta information to Facebook images
- rename access delegate protocol
- extended NSOutlineViewDelegate to IMBOutlineViewDelegate for badge clicking
- extend date formatting to account for Facebook-formatted dates
- add revocability of access to IMBNode
- implement access revocation in IMBFacebookAccessController
- send Facebook accessor object to XPC service
- and others...
Remove some code that was commented out
Propagate potential error object back to caller on logout
Remove facebook:tokenResult method from PhFacebook delegate
Remove node from IMBFacebookAccessController state

No longer need node property after switching to block-based completion handling (block inherits scope where node is defined anyway)
Match method signatures required by SBPerformSelectorAsync() for various methods on IMBFacebookParserMessenger
Remove Social and Accounts framwork dependencies

Since we decided to not depend on it yet regarding Facebook parser
Be more verbose with some error messages logged to console
Better match method signature of -[IMBFacebookParser revokeAccessToNode:error:] with pendant on IMBFacebookParserMessenger