Few fixes

[laszukdawid]

• Fixes failing tests due to previous pull request. With simple extrema detection we create a new index array and ignore whatever is provided. Tests dependent on provided index arrays.
• Disable logging configuration. Let the user define these configuration themselves, otherwise we override global setting (logging module is a singleton).
• Moved BEMD and EMD2D from PyEMD import.
• Updated Travis to check Python3.6 and ignore Python3.4. Main reason for skipping Python3.4 is that scikit-image don't support it which we use for BEMD and EMD2D, so that's not a deal breaker. If needed, this can be reverted.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@70c6eac). Click here to learn what that means. The diff coverage is 88.46%.

@@            Coverage Diff            @@
##             master      #50   +/-   ##
=========================================
  Coverage          ?   67.58%           
=========================================
  Files             ?       17           
  Lines             ?     1817           
  Branches          ?      176           
=========================================
  Hits              ?     1228           
  Misses            ?      559           
  Partials          ?       30

Impacted Files	Coverage Δ
PyEMD/__init__.py	100% <ø> (ø)
PyEMD/BEMD.py	22.33% <0%> (ø)
PyEMD/EMD.py	87.32% <100%> (ø)
PyEMD/tests/test_bemd.py	26.25% <100%> (ø)
PyEMD/tests/test_extrema.py	100% <100%> (ø)
PyEMD/tests/test_emd2d.py	13.7% <100%> (ø)
PyEMD/splines.py	100% <100%> (ø)
PyEMD/EMD2d.py	16.31% <66.66%> (ø)

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