Pull request (lk.lkaz)

Dear Triangle717:

 Hello, my screen name is "lk.lkaz". I am an user of your "LDR Importer" Blender addon. 
 Today, I am writing this message for two purposes. 

  1) Report a bug fix, and my idea for faster importing. 
  2) Ask for permission to upload my mod program to my brickshelf page. 


1) Report a bug and ideas
 First, I found a bug while importing "2555.dat". It separates into 2 objects. 
I figured out an idea for fix it. Search "lk_mod_1" to see what I changed. 
 Second, I modified the way of creating mesh and object in LDrawFile() for faster importing. 
Search "lk_mod_2", "lk_mod_3", and "lk_mod_4" to see what I changed. 
 If you like my modifications, would you accept them for next release, please? 


2) Ask for permission
 I think that the last modification "lk_mod_5" is not suitable for common use. 
It is made for my specific perpose. I am now making a re-exporter program. 
My plan is like this -->
  a) Import a LDraw model into Blender. 
  b) Set location by rigid_body simulation. 
  c) Export a new LDraw model with simulated location. 
  d) Render by POV-Ray with LGEO library. 
 When I finished the work, I want to publish the exporter program with the paired importer program. 
 Is it possible to upload my mod program(based on your v1.1.0) to my brickshelf page? Or upload it to github as a new branch?

Sincerely,
lk.lkaz