removed deprecated glPushAttrib and glPopAttrib

Since in OpenGl 3 these are deprected, it messed things up while
rendering to an FBO, beacuse scissor test was still enabled. Now we
disable it at the end, let PopStyle take care of the blending and depth
test is disabled by default anyway.
Merge pull request #108 from patrickFuerst/master

removed deprecated glPushAttrib and glPopAttrib
debug and release property sheets
fixed snapping and keyframe delete bugs
updated empty example for 0.8.1 and VS 2012
fixed snapping
added ability to get time domain samples
removed commenting of runWindow in ofOpenALSoundPlayer_TimelineAdditions
merged featured with develop branch