fixes to compile on windows vs2012
switch from carbon -> cocoa load dialog
switch from carbon -> cocoa alert dialog
switch from carbon -> cocoa save dialog
Merge pull request #2306 from danthemellowman/bug-fix-windows-build

fixes to compile on windows vs2012
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	libs/openFrameworks/video/ofQuickTimeGrabber.cpp
log level name padding is now in ofGetLogLevelName, updated some comments
use Core Text for locating system font files on OSX
wrap dialog calls in NSAutoreleasePool
visual studio rtAudio libs from liquidzym's pull request. closes #2098
Merge pull request #2309 from openframeworks/rtAudio-vs

visual studio rtAudio libs from liquidzym's pull request. closes #2098
ofFile: fix writeFromBuffer
xmlExample: use load/save instead of buffers and files
Closes #2310
Merge branch 'develop' of github.com:openframeworks/openFrameworks into develop
ofXml: fixes warnings + potential crash. Closes 2268
ofXml: add close method. Closes #2311
ofXml: fix close method
ofXml: fix for potential leak
ofXml: more fixes for the = operator
ofXml: fix = operator
PG simple updated to latest master