Restructure config

[brenmous]

• Reorganised config
• Throw error when required parameters haven't been provided
• Provide fallback values where appropriate
• Separate block for pickle files

closes #63

[brenmous]

See the test config at tests/test_data/sirsam/random_forest/sirsam_Na_randomforest.yaml for some comments regarding changes to format.

[codecov-io]

Codecov Report

Merging #89 into develop will decrease coverage by <.01%. The diff coverage is 62.4%.

@@             Coverage Diff             @@
##           develop      #89      +/-   ##
===========================================
- Coverage    63.59%   63.58%   -0.01%     
===========================================
  Files           32       32              
  Lines         3469     3460       -9     
===========================================
- Hits          2206     2200       -6     
+ Misses        1263     1260       -3

Impacted Files	Coverage Δ
uncoverml/predict.py	33.83% <0%> (ø)	:arrow_up:
uncoverml/scripts/gridsearch.py	0% <0%> (ø)	:arrow_up:
uncoverml/config.py	72.28% <64.94%> (-1.54%)	:arrow_down:
uncoverml/features.py	77.86% <66.66%> (ø)	:arrow_up:
uncoverml/scripts/uncoverml.py	65.64% <68.75%> (+0.16%)	:arrow_up:
uncoverml/cubist.py	70.94% <0%> (+1.68%)	:arrow_up:

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