Incorrect doxygen comment
:lipstick: removed trailing whitespaces
structure's scale attribute now traverse + tests

Memory deallocation tests are now much more precise, in that they do not rely
on how and when python allocates memory.
Instead, the tests checks when extension objects tracked, and that they do
disappear from tracking after deletion.
:bug: when importing config variable that does not exist
Add a function to run all of pylada's nose tests
Merge pull request #3 from pylada/memory_tests

Memory tests