Stretchy IK-FK Arm Rigger with Auto Clavicle

1. Found under Customize user interface->Toolbars->catagory->Savas_scripts->Arm_Rigger.
2. Entire arm bone hierarchy must selected before running the script.
3. Arm bone hierarchy must start with and include a clavicle bone. 
4. Arm bones hierarchy must be created from top view. 
5. There must be a slight angle between upper arm and lower arm so that ik system works correctly.
6.  Hand rig is not yet implemented, maybe in future versions. 
7. Two different arm systems included as max file. 
8. Open one of sample files and double click clavicle bone and run the script

 /* on 0.2 alpha

• Added auto  twist system.
• Growing-shrinking IK_FK handle system is from  MATHIESON FACER's tutorial.
• Auto Clavicle system is an enhanced version fo Alessandro Camporota's auto clavicle setup  tutorial.
• Added stretchy  twist bones (lower arm twist system from:  Henrique Lundeqvist->youtube. Upper arm twist system from: Felix Joleanes-> tutorial   )
• locked transforms of  FK swivel target 

• -- There is a problem with hierarchies consist of 4 bones (will be fixed) *FIXED