More docker improvements

[wtgee]

These are aimed at making the images work for arm (rpi) as well as various google cloud services. Other cleanup as well.

• Changed the horizon module to use numpy interpolation so we don't need to explicitly install scipy.

• Docker Tools:

  • Don't install a separate conda environment, just use the base to help reduce image size, complexity.
  • Cleanup unused dependencies.
  • Conda environment built from resources/environment.yaml.

• Testing:

  • Adios travis!

[codecov[bot]]

Codecov Report

Merging #252 into develop will increase coverage by 0.08%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #252      +/-   ##
===========================================
+ Coverage    78.93%   79.02%   +0.08%     
===========================================
  Files           51       49       -2     
  Lines         3167     3089      -78     
  Branches       284      273      -11     
===========================================
- Hits          2500     2441      -59     
+ Misses         617      607      -10     
+ Partials        50       41       -9     

Impacted Files	Coverage Δ
src/panoptes/utils/horizon.py	100.00% <100.00%> (ø)

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