Merge pull request #3 from jthiem/master

Add support for logical/bool matrices
Matlab now prints to Python's stdout
Fix regression in messenger.c

sometimes, strings were not terminated correctly
Eval is not special any more.

Turns out, eval can not be called with an empty string. Selecting
another no-op on startup fixes the issue.

Fixes #5
Fixed a few shutdown-related errors

`Matlab` should now shut down more reliably on deletion.
merged latest changes from bastian