Added traverse_to_root, added tests

[stefanoborini]

Added function traverse_to_root to walk from a node to the root.

[codecov-io]

Codecov Report

Merging #11 into master will increase coverage by 0.11%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   88.43%   88.54%   +0.11%     
==========================================
  Files          10       10              
  Lines         389      393       +4     
  Branches       55       56       +1     
==========================================
+ Hits          344      348       +4     
  Misses         27       27              
  Partials       18       18

Impacted Files	Coverage Δ
simphony_metaparser/utils.py	85% <100%> (+3.75%)	✅

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