don't replace . for template dirs in the notes command

[B4dM4n]

This change fixes a test failure when the generated name from tmpdir_factory.getbasetemp() contains a ..

When the notes command processes the apps list, it replaces all . with / and tries to walk the resulting path. This breaks when it encounters a template dir that contains a ., in which case the resulting path is wrong and can't be found.

The new test_with_template_sub_dirs test would fail without the change to the notes command that fixes the issue.

[coveralls]

Coverage decreased (-0.004%) to 71.339% when pulling 21479c6 on B4dM4n:notes-command into 8bc17b3 on django-extensions:master.

[coveralls]

Coverage decreased (-0.004%) to 71.339% when pulling 21479c6 on B4dM4n:notes-command into 8bc17b3 on django-extensions:master.