Acyclic graph take

[santiagoginero]

Changes

• Created the function AcyclicGraphTake which accepts a directed, acyclic graph and a list of two vertices, returning the intersection of the in-component of the first vertex (i.e. start vertex) with the out-component of the second vertex (i.e. end vertex).
• Function definition, tests, and documentation are all provided.

Error checking

• The function checks for invalid inputs of the form of the graph not being directed and acyclic, the vertices not being part of the graph, incorrect argument count, among others.

Examples

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This change is 

[santiagoginero]

Thanks! Just finished the changes.