removed No Answer, int to float

[bendichter]

No description provided.

[codecov]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   81.13%   81.13%           
=======================================
  Files           5        5           
  Lines         106      106           
=======================================
  Hits           86       86           
  Misses         20       20           

Flag	Coverage Δ
#unittests	81.13% <100.00%> (ø)

Impacted Files	Coverage Δ
src/pynwb/ndx_survey_data/survey_definitions.py	100.00% <100.00%> (ø)
src/pynwb/tests/test_ext.py	100.00% <100.00%> (ø)

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