Changed "id" and "desc/description" properties to "identifier" and "summary", respectively, as the previous names having other meanings in Objective-C.

Also fixed XCode project warnings.

git-svn-id: https://svn.apache.org/repos/asf/chemistry/objectivecmis/branches/browser-binding@1591478 13f79535-47bb-0310-9956-ffa450edef68