Move towards NPM for Cornerstone dependencies

LesionTracker/client/log.js

@@ -1,3 +1,3 @@
-// Create application logger using loglevel
-// https://atmospherejs.com/spacejamio/loglevel
-log = loglevel.createAppLogger('LesionTracker', defaultLevel = 'info');
+import loglevel from 'loglevel';
+log = loglevel.getLogger('OHIFViewer');
+log.setLevel('info');