Introduce prefix versioning in URL:

 - /GLM.json - old GLM
 - /2/GLM.json - Fluid vector based GLM
Python REST api wrapper modified.
downloadCsv renamed to DownloadDataset respecting class name.
Comments.
Merge remote-tracking branch 'origin/master' into vers
Merge remote-tracking branch 'origin/master' into vers
R Client now using v2.0 API for all pages based on Request2.
Merge remote-tracking branch 'origin/master' into vers
Merge remote-tracking branch 'origin/master' into vers
Merge remote-tracking branch 'origin/master' into vers