Merge pull request #229 from squeek502/make-vs2017

make.bat: Check for VS2017 and use that if it exists

Author: zhaozg

make.bat

@@ -6,6 +6,8 @@ set LUVI_PUBLISH_REPO=luvi
 set GENERATOR=Visual Studio 12
 reg query HKEY_CLASSES_ROOT\VisualStudio.DTE.14.0 >nul 2>nul
 IF %errorlevel%==0 set GENERATOR=Visual Studio 14
+reg query HKEY_CLASSES_ROOT\VisualStudio.DTE.15.0 >nul 2>nul
+IF %errorlevel%==0 set GENERATOR=Visual Studio 15
 set GENERATOR64=%GENERATOR% Win64
 
 for /f %%i in ('git describe') do set LUVI_TAG=%%i