Don't run invoke commands under a PTY

Running them under a PTY makes the build log a big bad mess

tasks.py

@@ -116,15 +116,15 @@ def assets(ctx, watch=False):
 
     # Be sure to have all the dependencies installed
     if not os.path.exists(node_bin):
-        invoke.run("yarn", pty=True)
+        invoke.run("yarn")
 
     if watch:
         try:
-            invoke.run("%s/gulp watch" % node_bin, pty=True)
+            invoke.run("%s/gulp watch" % node_bin)
         except KeyboardInterrupt:
             pass
     else:
-        invoke.run("%s/gulp" % node_bin, pty=True)
+        invoke.run("%s/gulp" % node_bin)
 
 
 @invoke.task(pre=[assets])