Log Message:
Update ruby-rgl to 0.5.0.

2014-12 Release 0.5.0

This release mainly contains the contributions of Kirill, who added many \ 
algorithms to the library. Thank you Kirill!

 * @matiaskorhonen: Fixes the image paths in the README (#14)
 * @monora: Implicit graph example fails (#13)
 * @KL-7: Implement Graph#bipartite_sets. (#12)
 * @monora:  syntax error in dot file for undirected graph (#11)
 * @KL-7: Edmonds-Karp algorithm for maximum flow (#10)
 * @KL-7: Prim's algorithm for minimum spanning tree (#9)
 * @carlosantoniodasilva: Run tests on Ruby 2.0 and remove deprecation warning (#8)
 * @KL-7: Bellman-Ford shortest paths algorithm (#7)
 * @KL-7: Minor improvements (asserts) for Dijkstra algorithm (#6)
 * @KL-7: Add Dijkstra shortest path algorithm. (#5)
 * @KL-7: Indentation and whitespaces clean up of examples (#4)
 * @KL-7: Travis configuration and README updates (#3)
 * @KL-7: Code clean up and configuration updates (#2)
 * @aschoerk: Renamed test-directory, (includes Rakefile), fixed TestComponents (#1)