adding support for `metadata.py` and `metadata.json`

[keighrim]

fixing #117 .

[codecov[bot]]

Codecov Report

Merging #128 (33d35f0) into develop (8d20e56) will decrease coverage by 0.60%. The diff coverage is 61.53%.

@@             Coverage Diff             @@
##           develop     #128      +/-   ##
===========================================
- Coverage    77.05%   76.45%   -0.60%     
===========================================
  Files            7        7              
  Lines          536      548      +12     
===========================================
+ Hits           413      419       +6     
- Misses         123      129       +6     

Flag	Coverage Δ
unittests	76.45% <61.53%> (-0.60%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
clams/app/__init__.py	84.67% <61.53%> (-2.83%)	:arrow_down:

... and 1 file with indirect coverage changes

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