Added a bat file for running all the unit tests through different versions of visual studio.

.hgignore

@@ -27,3 +27,5 @@ docs/docs/python/functions.txt
 syntax: glob
 dlib/test/build64/*
 *.svm
+dlib/test/build_python
+dlib/test/test_log.txt

dlib/test/WINDOWS_build_and_run_all_unit_tests.bat

+date /T > test_log.txt
+time /T >> test_log.txt
+
+rem the pings are to wait between builds so visual studio doesn't get in a funk.
+
+
+
+echo testing python >> test_log.txt
+rm -rf build_python
+mkdir build_python
+cd build_python
+cmake -G "Visual Studio 14 2015 Win64" ../../../tools/python  -DPYTHON3=ON
+cmake --build . --config Release --target install || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cd ..
+
+
+
+
+
+
+echo testing vc2013 >> test_log.txt
+rm -rf build_vc2013_64
+mkdir build_vc2013_64
+cd build_vc2013_64
+cmake -G "Visual Studio 12 2013 Win64" .. 
+cmake --build . --config Release || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cmake --build . --config Debug || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cd Release
+dtest --runall -d || exit /B
+cd ..
+cd ..
+
+
+
+echo testing vc2012 >> test_log.txt
+rm -rf build_vc2012_64
+mkdir build_vc2012_64
+cd build_vc2012_64
+cmake -G "Visual Studio 11 2012 Win64" .. 
+cmake --build . --config Release || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cmake --build . --config Debug || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cd Release
+dtest --runall -d || exit /B
+cd ..
+cd ..
+
+
+echo testing vc2015 >> test_log.txt
+rm -rf build_vc2015_64
+mkdir build_vc2015_64
+cd build_vc2015_64
+cmake -G "Visual Studio 14 2015 Win64" .. 
+cmake --build . --config Release || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cmake --build . --config Debug || exit /B
+ping 127.0.0.1 -n 5 -w 1000 > null
+cd Release
+dtest --runall -d || exit /B
+cd ..
+cd ..
+
+
+
+del null
+type test_log.txt
+
+date /T
+time /T
+