R client updates
R client updates

1) bug fixes to Dataset constructor and create entity method
2) loadEntity method for Expression layers in GEO format
3) Added curation demo script

xschildw/Synapse-Repository-Services,xschildw/Synapse-Repository-Services,Sage-Bionetworks/Synapse-Repository-Services,hhu94/Synapse-Repository-Services,zimingd/Synapse-Repository-Services,hhu94/Synapse-Repository-Services,xschildw/Synapse-Repository-Services,xschildw/Synapse-Repository-Services,hhu94/Synapse-Repository-Services,zimingd/Synapse-Repository-Services,hhu94/Synapse-Repository-Services,Sage-Bionetworks/Synapse-Repository-Services,Sage-Bionetworks/Synapse-Repository-Services,zimingd/Synapse-Repository-Services,zimingd/Synapse-Repository-Services,Sage-Bionetworks/Synapse-Repository-Services