Merge pull request #321 from gavincornwell/1.4-dev

MOBSDK-743: Add networks property to CloudSession
Merge pull request #322 from gavincornwell/1.4-dev

MOBSDK-764, MOBSDK-765 & MOBSDK-687: Fixed crashes coming from the SDK
Merge pull request #323 from gavincornwell/1.4-dev

MOBSDK-735: Allow a users checked out documents to be retrieved.
MOBSDK-731: Improvements to the DocumentFolderService (ability to add aspects)
Merge branch '1.4-dev' of https://github.com/Alfresco/alfresco-ios-sdk into 1.4-dev
MOBSDK-739: Allow folders (and other types) to be searched for by keywords
MOBSDK-754: Error when trying to search quoted terms
MOBSDK-733: Implement user search for Cloud based sessions.