Improvements related to BFS/DFS/Dijkstra (ticket #96)
- Add run(s,t) function to BfsVisit.
- Modify run(s,t) functions in the class interfaces to return bool value.
- Bug fix in Dijkstra::start(t) function.
- Improve Dijkstra::currentDist().
- Extend test files to check named class template parameters.
- Doc improvements.

 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})

 LINK_DIRECTORIES(${CMAKE_BINARY_DIR}/lemon)

 SET(DEMOS

   arg_parser_demo

   graph_to_eps_demo

   lgf_demo)

 FOREACH(DEMO_NAME ${DEMOS})

   ADD_EXECUTABLE(${DEMO_NAME} ${DEMO_NAME}.cc)

   TARGET_LINK_LIBRARIES(${DEMO_NAME} lemon)

 ENDFOREACH(DEMO_NAME)