Bugfix: IfcSweptDiskSolid need to have hasCurves set

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35106
Fixed broken Haad branch (missing null params for new COBie validation code)

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35109
Added option to process subfolders in XbimConvert.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35151
Merge remote-tracking branch 'tfs/default'