RDMAConnection windows conversion
first working windows version
!!may not build with linux - untested!!
small cleanups
fixed linux connection
removed debug code
windows and linux event improvements
replaced atomics with spinlocks
small additions
Minor cleanup
Fix reporting of GL errors in eqPixelBench (#159):
* debugGLError now throws new GLException
* eqPixelBench::Channel catches exception
* Therefore GL errors in new code paths using EQ_GL_CALL macros are
  reported now.
* Beautify output in eqPixelBench

Creates new functionality:
* eq::GLException class
* eq::glError enum-to-string converter
Fix #161: Use correct endianess define
Fix regression introduced by fix for #161: Need to revisit this bug, it
did the inverse of what it was supposed to do?
Code cleanups
Partial fix for #159: The async finish readback unbound the channel
FBO. Still crashing with a malloc error later on.
Improve gl debugging while hunting #159
Fix another assertion for #159. I can't reproduce the concrete error for
which this issue was opened. Will try later with an nVidia Linux driver.

I still see occassional malloc errors with multiple pipe threads on my
Mac somewhere below glBegin. From the looks of it this is yet another
thread-safety issue in the OS X OpenGL implementation.
Const-correctness fixes
Update Release Notes
Compile fix
Update Relnotes
Fix #175: "--eq-logfile" followed by no other argument segfaults