Merge pull request #5 from eugene-rakhmatulin/master

Added spinner for High Dimension Data
Update grails-app/services/I2b2HelperService.groovy

fix default level issue - new ETL pipeline loads root node with c_hlevel =0. breaks the code.
changed it to find the smallest c_hlevel and make it as the default root
Update grails-app/services/I2b2HelperService.groovy

fix sql initialization
Update web-app/js/datasetExplorer/requests.js

fix security token