Hotfix/core neo4j io

[eugeniashurko]

• Updated Neo4j-based analytics utils to use GDS 1.6.1
• Updated Travis Neo4j 4.3.1 (+ installation docs)
• Fixed graph-tool version to 2.37 (due to the breaking changes in the new API of 2.4X)
• Bugfixes:
  • PandasPGFrame.from_ontology
  • pgframe_to_neo4j
  • encoders (semantic pg encoder)

[codecov-commenter]

Codecov Report

Merging #76 (b59ce59) into master (906609c) will decrease coverage by 0.32%. The diff coverage is 69.69%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   81.09%   80.76%   -0.33%     
==========================================
  Files          41       41              
  Lines        3623     3645      +22     
==========================================
+ Hits         2938     2944       +6     
- Misses        685      701      +16     

Impacted Files	Coverage Δ
bluegraph/backends/neo4j/analyse/metrics.py	72.09% <ø> (ø)
bluegraph/backends/neo4j/analyse/paths.py	80.55% <ø> (ø)
bluegraph/backends/neo4j/embed/embedders.py	90.99% <ø> (ø)
bluegraph/backends/neo4j/io.py	91.53% <33.33%> (-0.58%)	:arrow_down:
bluegraph/core/io.py	63.89% <72.41%> (-0.89%)	:arrow_down:
bluegraph/preprocess/encoders.py	74.34% <100.00%> (+0.11%)	:arrow_up:

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