fixed python3.6 dateutil requirement

[dizcza]

python-dateutil>1.4,<2.0 in requirements installs v1.5 by default which seems to be buggy at least for python3.6:

python3.6 -c "import caffe" produces raise ValueError, "Can't create weekday with n == 0" with python-dateutil==1.5.

The latest python-dateutil==2.6.0 doesn't have this error.

Full traceback:

$ python3.6 -c "import caffe"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/dizcza/caffe/python/caffe/__init__.py", line 1, in <module>
    from .pycaffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, RMSPropSolver, AdaDeltaSolver, AdamSolver
  File "/Users/dizcza/caffe/python/caffe/pycaffe.py", line 15, in <module>
    import caffe.io
  File "/Users/dizcza/caffe/python/caffe/io.py", line 2, in <module>
    import skimage.io
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/__init__.py", line 15, in <module>
    reset_plugins()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/manage_plugins.py", line 93, in reset_plugins
    _load_preferred_plugins()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/manage_plugins.py", line 73, in _load_preferred_plugins
    _set_plugin(p_type, preferred_plugins['all'])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/manage_plugins.py", line 85, in _set_plugin
    use_plugin(plugin, kind=plugin_type)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/manage_plugins.py", line 255, in use_plugin
    _load(name)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/manage_plugins.py", line 299, in _load
    fromlist=[modname])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/skimage/io/_plugins/matplotlib_plugin.py", line 3, in <module>
    import matplotlib.pyplot as plt
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/pyplot.py", line 37, in <module>
    from matplotlib.figure import Figure, figaspect
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/figure.py", line 40, in <module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/axes/__init__.py", line 4, in <module>
    from ._subplots import *
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/axes/_subplots.py", line 10, in <module>
    from matplotlib.axes._axes import Axes
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/axes/_axes.py", line 24, in <module>
    import matplotlib.dates as _  # <-registers a date unit converter
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/dates.py", line 125, in <module>
    from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/dateutil/rrule.py", line 55
    raise ValueError, "Can't create weekday with n == 0"

[weiliu89]

Thanks for fixing it.