Added support for path queries and function to join kmers (#61)

[kevinkle]

• Add the initial code for querying path

• Debug providing Edge.eq broke hashable?

• Add a test against LGGraph.path() that will fail

• Add a test against LGGraph.path() that will fail

• Ignore node in LGGraph.path() query, and unravel

• Convert to a Edge before calling LGGraph._find_path()

• Do a cast to int if Edge.incr is not int

• Fix Edge.incr cast if None, and pass txn into LGGraph._find_path()

• See what chain were getting

• Return the Nodes for a path as a tuple

• Allow tests to pass if working

• <2 not <=2

• <2 not <=2

• Fix: paths is a nested tuple

• Fix linting errors

• Add additional tests for LGGraph.path()

• Add additional tests for LGGraph.path()

• Add code to rejoin Node values, and tests against it

• Add code to rejoin Node values, and tests against it

[codecov[bot]]

Codecov Report

Merging #62 into master will increase coverage by 2.1%. The diff coverage is 91.8%.

@@            Coverage Diff            @@
##           master      #62     +/-   ##
=========================================
+ Coverage   70.35%   72.45%   +2.1%     
=========================================
  Files          15       15             
  Lines         560      610     +50     
=========================================
+ Hits          394      442     +48     
- Misses        166      168      +2

Impacted Files	Coverage Δ
prairiedog/errors.py	46.15% <0%> (ø)	:arrow_up:
prairiedog/graph.py	78.57% <100%> (ø)	:arrow_up:
prairiedog/edge.py	100% <100%> (ø)	:arrow_up:
prairiedog/node.py	88.88% <81.81%> (+1.38%)	:arrow_up:
prairiedog/lemon_graph.py	89.44% <95%> (+2.44%)	:arrow_up:

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