allow stimulus_description in ScalaNWBReader

[darshanmandge]

• To get protocol_name from stimulus_description entries to allow ecodes names other than Step
• Preserves the default protocol_name Step for Scala files
• Tested for collaborator files for hippocampus and straitum

[darshanmandge]

Thanks @AurelienJaquier . I added a exception AttributeError with a default protocol_name Step.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.68%. Comparing base (4bfe32a) to head (cb6f730). Report is 6 commits behind head on master.

Files	Patch %	Lines
bluepyefe/nwbreader.py	0.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #183 +/- ## ========================================== - Coverage 73.78% 73.68% -0.11% ========================================== Files 38 38 Lines 2415 2421 +6 ========================================== + Hits 1782 1784 +2 - Misses 633 637 +4 ```

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[AurelienJaquier]

do you still need the update_scala branch @darshanmandge ? If not, could you delete it?

[darshanmandge]

deleted. thanks!