added playground project and made (again) the common.cmake behave when included multiple times
diff --git a/.gitignore b/.gitignore
index 74be3b2..f7eed5b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,11 +25,9 @@
 *.s
 
 # My garbage :)
+Win32/
+x64/
 scripts/bench/project/*
-build/*
-build-mingw/*
-examples/*/build/*
-examples/*/build-mingw/*
-scripts/*/build/*
-scripts/*/build-mingw/*
+build/
+build-mingw/
 *.pyc