add analytics to docs
add multi-stim-multi-response plugin
bug fix in displayData
bug fixes
fix default value for choices

Closes #83
record stimulus as a single entry in data

Closes #79
change data format for survey questions

Closes #80
fix issue with flatten data

Fixes #85
bug fix: issue #86

fixes #86
using display_element in visual search

related to issue #81
better default value for timing_tim
Merge pull request #89 from jodeleeuw/dev

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