Fix dylibbundler options
Upgrade to dylibbundler 0.4.4
OSX: change -FOpenGL to -iframeworkOpenGL
MEX-file: disable warning for "long long"

... this is used in some Matlab header ...
Add lock for subscriber list and fix unsubscribe bug

This hopefully fixes #6.
IP interface: add flag to see if Connection is subscribed

This avoids a spurious unsubscribe() call in the destructor.
Improve handling of port numbers

Closes #7.