Cleaned up windows build, added readme. Added Boost binaries.

emulator/readme_windows.txt

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+Prerequisites:
+- Qt5 for Windows (provides C:\Qt\5.4\mingw491_32  and C:\Qt\Tools\mingw491_32)
+- Mingw msys-base (provides C:\MinGW\msys\1.0 and make, find )
+- Boost (check emulator\libs\boost)
+
+Steps:
+- Open up the msys shell using the batchfile
+- Navigate to the emulator folder of the project
+- Source the qt binaries (qmake, gcc, g++) by executing 
+  export PATH=$PATH:/c/Qt/Tools/mingw491_32/bin:/c/Qt/5.4/mingw491_32/bin
+- navigate to libs/Pixy and execute make
+- navigate back into the emulator folder and execute make
+- this should generate you build/emulator.exe
+
+Starting:
+- Extract windows_dlls.rar to the build folder
+- Copy the emulated folder into the build folder
+- Make sure that you installed the pixy usb driver (e.g. by installing pixymon http://cmucam.org/projects/cmucam5/wiki/Latest_release)
+- Start emulator.exe
+
+Pitfalls:
+- libstdc++ must be provided by qt. do not use one of msys or mingw. you will waste hours with debugging of the make process
+
+Sources:
+- libusb for windows was taken from https://github.com/charmedlabs/pixy/tree/master/src/host/windows
+- Boost was compiled from sources, using http://andres.jaimes.net/718/how-to-install-the-c-boost-libraries-on-windows/ and http://www.boost.org/doc/libs/1_58_0/more/getting_started/windows.html