[PlanetCCRMA] pd externals: gem, iemlib, zexy

[Fernando Pablo Lopez-Lezcano]

Hi all, I'm working on finding useful Pd externals. So far I have added:
  * iemlib
  * zexy
As usual, "apt-get install iemlib zexy" will install them (after an 
"apt-get update", of course). URLs in the Planet CCRMA pages.

I have also updated Gem to its last version (0.87) and I have added 
quicktime4linux support. The Gem examples that use movies now work 
correctly (well, almost, I have some problems with regards to OpenGL but 
that might be due to the video card I have tested on). 

-- Fernando