Moves check to getCurrentPipe
Checks if the next pipe has the proper entry
Moves flow calculation to the board
Adds getPipe
Calculates possible trajectories
Debug flow path algorithm only allowing the creation of pipes with 2 connections (1 in 1 out).
Improve getNextPipe method.
Merge pull request #24 from fabiokr/flow

Determina a proxíma direção do flow