Add routes to edit project properties and execute data processes

[protobi-pieter]

Add routes to get/set project properties, and to execute data processes remotely:

url1 <- paste(PROTOBI_HOST, '/api/v3/dataset/',PROTOBI_DATASETID,'/properties','?apiKey=',PROTOBI_APIKEY,'&key=','params.randvar','&value=','foobar',sep='')
res <- httr::PUT(url ,encode = "json")

url2 <- paste(PROTOBI_HOST, '/api/v3/dataset/',PROTOBI_DATASETID,'/data/test_process/run','?apiKey=',PROTOBI_APIKEY,sep='')
res <- httr::PUT(url2 ,encode = "json")