Data restructure

[jankrepl]

Turning the data module into a subpackage.

Also created a simple sin example for synthetic data

[codecov]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #50   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        18    +3     
  Lines         1619      1611    -8     
=========================================
- Hits          1619      1611    -8     

Impacted Files	Coverage Δ
deepdow/data/__init__.py	100.00% <100.00%> (ø)
deepdow/data/augment.py	100.00% <100.00%> (ø)
deepdow/data/load.py	100.00% <100.00%> (ø)
deepdow/data/synthetic.py	100.00% <100.00%> (ø)

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