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 looking closely now i noticed that you only removed the commented line, for some reason i earlier thought that you un-commented that line and removed .inspect. Sorry for the confusion.