Merge pull request #97 from gavincornwell/master

MOBSDK-459: Provide logging utility
MOBSDK-516: additional methods on DocFolder service; MOBSDK-527, SDK version set to 1.1.0
Merge branch 'master' of https://github.com/Alfresco/alfresco-ios-sdk. Conflicts resolved
Merge pull request #98 from pwschmidt/master

MOBSDK-516/527
MOBILE-459 and MOBSDK-379. CMISLog level is now synced with and changes to the AlfrescoLog level, cleaned up more log statements and also enabled metadata extraction in the SDK samples app.