Removed DHTMLXTREE code residue

Grepped the code for all DHTMLXTREE related occurrences. 
For e.g. -
1. node['id']
2. node['text']
3. node['im0'], node['im1'], node['im2']
4. node['item']
and deleted/addressed it.

#118
@AparnaKarve just wondering why this line was commented previously, also did you check if we don't need .inspect on that line anymore.