FIX: Patch Path.mkdir for Python 2

[effigies]

Summary

This should be a blessedly short-lived hack, but it is needed to resolve nipy/heudiconv#374.

List of changes proposed in this PR (pull-request)

• Path.mkdir() was failing for Python 2, due to a PY3 guard
• Had to import TemporaryDirectory from nipype.utils.tmpdirs instead of tempfile
• Updated our existing makedirs hack to include mode, for full replacement of os.makedirs

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[oesteban]

Not sure this will solve nipy/heudiconv#374 though.

[effigies]

It did.

[codecov]

Codecov Report

Merging #3037 into master will increase coverage by 0.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master    #3037      +/-   ##
==========================================
+ Coverage   67.51%   67.53%   +0.01%     
==========================================
  Files         344      344              
  Lines       44094    44093       -1     
  Branches     5556     5555       -1     
==========================================
+ Hits        29772    29779       +7     
+ Misses      13576    13568       -8     
  Partials      746      746

Flag	Coverage Δ
#smoketests	50.33% <50%> (+0.02%)	⬆️
#unittests	64.99% <92.85%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
nipype/utils/filemanip.py	80.65% <92.85%> (-0.04%)	⬇️
nipype/utils/tmpdirs.py	80.76% <0%> (+30.76%)	⬆️

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