plot from NWB files

[luiztauffer]

I added a file 'plot_from_nwb.py' that allows the use of the visualization tools from img_pipe but reading directly from NWB files. The changes contain:

• the 'plot_from_nwb.py' file, located at '/plotting' directory
• the Jupyter Notebook tutorial 'img_pipe_plot_from_nwb.ipynb', located at '/tutorials' directory
• Five image files for the tutorial, located at '/gallery' directory
• changed 1 line at the 'init.py' file from '/plotting', to load the new function
• added the dependency 'nwbext_ecog' to be installed from pip, at 'environment_py35.yml'

[bendichter]

@luiztauffer let's try to get the CI to pass. Could you add pynwb as a dependency?

[bendichter]

@luiztauffer can you try installing from environment_py36.yml? It's working on my machine but I can't get it to work on the continuous integration

[luiztauffer]

Doing the following made the conda install pass:

• Comment out some locks e.g. - curl=7.64.1 #=ha441bb4_0
• Comment out 'appnope', which is only available for mac.
• Added channels conda-forge and statiskit

Pip is still failing though.