Random matrix generator

[gitond]

• [ ] call the vertex constructor with randomly generated location values in input range
• [ ] do the same thing but now n times, where n is an integer inputted by the user and save the results to an array --- From this point: same things in #21 ---
• [x] create adjacency matrix with random weights
• [x] refine the weights so that wights between the same two graphs are always 0
• [x] refine the weights so that .price(v1,v2) == .price(v2,v1) always --- Up to this point: same things in #21 ---
• [ ] call the graph constructor with the generated vertex[n] and adjacency matrix
• [ ] investigate and fix bug #22