PTB BETA RELEASE "Blue skies and empty brains"

* Removal of support for 32-Bit OSX and OSX 10.4/10.5.
* GStreamer robustness and functionality improvements, esp. on OSX and Windows with Gstreamer SDK.
* Workarounds for Matlab's broken Java AWT memory leaks.
* Linux video refresh calibration precision improvement on FOSS drivers by fixing some mishandled corner case.
* Compile fix for gcc-4.8 + Octave, as found by Debian project.
* Eyelink and Snd() fixes by Andreas Widmann.
* SphereProjectionShader corner-case fix by Ingmar Schneider.