Animation merging

[rdeits]

on top of #115

[codecov-io]

Codecov Report

Merging #119 into master will decrease coverage by 6.07%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   76.04%   69.97%   -6.08%     
==========================================
  Files          14       14              
  Lines         405      443      +38     
==========================================
+ Hits          308      310       +2     
- Misses         97      133      +36

Impacted Files	Coverage Δ
src/animations.jl	32.78% <10%> (-43.41%)	⬇️
src/atframe.jl	75.75% <100%> (-1.39%)	⬇️

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