[Bugs] #4920 Physics HIGH: physics-27 fails to start

[Sugar Labs Bugs]

#4920: physics-27 fails to start
-------------------------------+--------------------------
       Reporter:  quozl        |       Owner:
           Type:  defect       |      Status:  new
       Priority:  High         |   Milestone:  Unspecified
      Component:  Physics      |     Version:
       Severity:  Major        |    Keywords:
Distribution/OS:  Unspecified  |  Bug Status:  New
-------------------------------+--------------------------
 physics-27 bundle installs fine but does not start, activity log contains:

 {{{
 Traceback (most recent call last):
   File "/usr/bin/sugar-activity", line 169, in <module>
     main()
   File "/usr/bin/sugar-activity", line 121, in main
     module = __import__(module_name)
   File "/home/olpc/Activities/Physics.activity/activity.py", line 64, in
 <module>
     import physics
   File "/home/olpc/Activities/Physics.activity/physics.py", line 40, in
 <module>
     import myelements as elements
   File "/home/olpc/Activities/Physics.activity/myelements/__init__.py",
 line 2, in <module>
     from .elements import Elements
   File "/home/olpc/Activities/Physics.activity/myelements/elements.py",
 line 655, in <module>
     class Query_CB(box2d.b2QueryCallback):
 AttributeError: 'module' object has no attribute 'b2QueryCallback'
 Exited with status 1, pid 2211 data (None, <open file '<fdopen>', mode 'w'
 at 0xa947d30>, '3b54003042c73066894cb01cc4c013d6c8879cd0')
 }}}

 Occurs on Fedora 18 and Ubuntu 15.10.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4920>
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