Import reload function from imp module explicitly for python3

[ghoshbishakh]

fixes #1104

[coveralls]

Coverage remained the same at 82.908% when pulling 2c66247 on ghoshbishakh:py3_restore_dti into 63f6a5f on nipy:master.

[codecov-io]

Current coverage is 80.84% (diff: 100%)

Merging #1105 into master will not change coverage

@@             master      #1105   diff @@
==========================================
  Files           200        200          
  Lines         23023      23023          
  Methods           0          0          
  Messages          0          0          
  Branches       2309       2309          
==========================================
  Hits          18614      18614          
  Misses         3933       3933          
  Partials        476        476          

Powered by Codecov. Last update 63f6a5f...2c66247

[arokem]

I'd rather remove the reload from the script. I think it's an unnecessary left over from work debugging this script.

[ghoshbishakh]

@arokem okey removing it then

[ghoshbishakh]

@arokem looks good?

[coveralls]

Coverage decreased (-0.4%) to 82.474% when pulling 609e21e on ghoshbishakh:py3_restore_dti into 63f6a5f on nipy:master.