ENH: Add more read options
FIX: Minor tweaks
FIX: Fix examples
Fix couple of examples

- post_processing needed to set viewport correctly - #523
- real_time signals needed data of proper shape - #528
- spacy dito

closes #523
closes #528
Merge pull request #527 from Eric89GXL/fix-col

FIX: Fix examples
Merge pull request #531 from almarklein/example-fix

Fix couple of examples
Merge pull request #520 from Eric89GXL/dtypes

ENH: Add more read options