Add and visualize Transcripts data

[luiztauffer]

• [X] Add Transcripts to current nwb file
• [X] Visualize transcripts tables in e modes: Simple, Hierarchical and Denormalized
• [x] Release ndx_hierarchical_behavioral_data on PyPI
• [x] Check for HierarchicalTables vs TimeIntervals ans change options accordingly

[bendichter]

@luiztauffer, could you give https://stackoverflow.com/a/44605011 a quick try?

[codecov[bot]]

Codecov Report

Merging #106 into master will decrease coverage by 0.35%. The diff coverage is 11.11%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
- Coverage   21.87%   21.52%   -0.36%     
==========================================
  Files          26       27       +1     
  Lines        5083     5232     +149     
==========================================
+ Hits         1112     1126      +14     
- Misses       3971     4106     +135     

Flag	Coverage Δ
#unittests	21.52% <11.11%> (-0.36%)	:arrow_down:

Impacted Files	Coverage Δ
ecogvis/functions/event_related_potential.py	7.73% <0.00%> (-0.04%)	:arrow_down:
ecogvis/functions/subFunctions.py	7.91% <7.14%> (-0.30%)	:arrow_down:
ecogvis/functions/misc_dialogs.py	10.46% <7.57%> (-0.23%)	:arrow_down:
ecogvis/ecogvis.py	11.61% <10.90%> (+0.09%)	:arrow_up:
ecogvis/functions/transcription_data.py	17.07% <17.07%> (ø)
ecogvis/signal_processing/processing_data.py	71.56% <100.00%> (ø)

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