build: exclude .git/.gitignore/.swp/.~ files in build

build/build.js

@@ -589,7 +589,7 @@
     //called dirExclusionRegExp before the 1.0.2 release.
     //As of 1.0.3, this value can also be a string that is converted to a
     //RegExp via new RegExp().
-    fileExclusionRegExp: /^(dir|py|build|inputs)$/,
+    fileExclusionRegExp: /^(dir|py|build|inputs|.*~|.git|.gitignore)$/,
 
     //By default, comments that have a license in them are preserved in the
     //output. However, for a larger built files there could be a lot of