Merge pull request #210 from YannRobert/FixBugInViewQueryCloneSkipProperty

Fixed bug in ViewQuery clone() method
Merge pull request #211 from YannRobert/FixBugInCloneFollowingIssue181

fixed bug in ViewQuery.clone() + fixed regression in getKey() getStartKey() getEndKey() methods
Merge pull request #213 from YannRobert/FixNPEInPageRequestWhenDocIdIsNull

PageRequest should support having a null next key docId
Merge branch 'master' into integration