Use JX.$AX() on the 'path' parameter to JX.Stratcom.invoke()
Use JX.$AX() on the 'path' parameter to JX.Stratcom.invoke()

Summary: See T627. The implementaiton strongly implies this works, but it
doesn't.

Test Plan:
Verified that bare string sigil paths now work correctly:

  > JX.Stratcom.listen('foo', 'bar', function() { console.log('OK') })
  (Object)
  > JX.Stratcom.invoke('foo', 'bar', {})
  OK
  (Object)

Reviewers: tomo, aran, mroch, leebyron, asukhachev

Reviewed By: aran

CC: aran, epriestley

Differential Revision: 1116

phacility/javelin,phacility/javelin,phacility/javelin,phacility/javelin,phacility/javelin