corrections in test suite

fix memory allocation flaws in test/t/osmfile/test_read_and_write
improve "clean" target in Makefile and test/Makefile
show valgrind output in test/run_tests.sh if it detects an error
Merge pull request #76 from jokoala/contribution

corrections in test suite
Disable some test if boost filesystem isn't version 3
Merge branch 'master' into ser