updated scalar example to fit into testing enviroment; added test routine for scalar example, but so far without any tests
added a test for the scalar example that verifies convergence orders for up to six lobatto nodes
removed first version of run_scalar_sdc function from scalar_sdc.cpp; instead, the main routine sets default values and calls the run function with these as parameter
in test_scalar, should now use size_t instead of int
test_scalar now used DoubleNear and checks directly within loop computing convergence rates
Merge pull request #64 from danielru/feature/scalar_tests

Very nice!  High fives!