MOBSDK-715: Commented documentation required in AlfrescoVersionService.h.

Also renamed the error code for recently added reachability feature to "kAlfrescoErrorCodeNoNetworkConnection" and removed last remaining log comments prefixed with ***
Merge pull request #284 from gavincornwell/master

MOBSDK-715 and some other minor changes
MOBSDK-719:  App crash due to problem with AlfrescoComment initialization
MOBSDK-721: Cloud Authentication request cannot be cancelled
Merge pull request #285 from msaeedi/master

MOBSDK-719, MOBSDK-721
MOBSDK-718: Network property is never populated in AlfrescoCloudSession