Allow for time-dependent observables

[goerz]

This is breaking because it adds arguments tlist, i to the storage-related routines.

[codecov[bot]]

Codecov Report

Merging #47 (a86112f) into master (bcb2399) will increase coverage by 1.21%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   83.68%   84.89%   +1.21%     
==========================================
  Files          16       16              
  Lines        1189     1192       +3     
==========================================
+ Hits          995     1012      +17     
+ Misses        194      180      -14     

Impacted Files	Coverage Δ
src/storage.jl	90.90% <92.85%> (+13.48%)	:arrow_up:
src/propagate.jl	91.11% <100.00%> (+2.47%)	:arrow_up:

... and 4 files with indirect coverage changes

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