c++11 compatibility fixes.
added -Wno-switch to C/C++ compiler flags on Mac OS X.
don't include Python.h directly as this causes linking problem on Windows with VS; include boost/python/detail/wrap_python.hpp instead.
fixed regression: the project explorer must remain enabled during interactive rendering.

regression introduced in 2bd657a6bbacdf8fd1ed7496d90fa7802aa05798 ("it is now possible to reload the current project during interactive rendering").
require CMake >= 2.8.12.

we're now relying on the 5-argument version of QT4_CREATE_MOC_COMMAND introduced in http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=9ce60ff509c4ff27fe861fc5b2080f50897a68c4.
preserve the state of the render widgets (zoom level, scrollbars position, etc.) across project reloads.
fixed linking of maketiledexr; cleaned up and refactored OpenEXR initialization code.
fixed regression: appleseed.studio would crash when loading a built-in scene.

regression introduced in d8903fd15f44ba22b7673beba1a8e7efda7ba26f ("preserve the state of the render widgets (zoom level, scrollbars position, etc.) across project reloads").
fixed linking on linux by specifying static libraries in order of reverse-dependency.
Merge branch 'master' of github.com:jupiter-jazz/appleseed
Merge remote-tracking branch 'upstream/master'