Git can now ignore the entire build dir

.gitignore

@@ -1,24 +1,6 @@
 *.pyc
 /bin/plovr*.jar
-/build/check-requires-timestamp
-/build/examples/*.combined.js
-/build/examples/*.json
-/build/gh-pages
-/build/glsl-unit
-/build/jsdoc
-/build/jsdoc-*-timestamp
-/build/lint-timestamp
-/build/ol-all.js
-/build/ol-simple.js
-/build/ol-whitespace.js
-/build/ol.css
-/build/ol.js
-/build/phantomjs-*-windows
-/build/phantomjs-*-windows.zip
-/build/proj4js
-/build/proj4js-*.zip
-/build/src
-/build/test/requireall.js
+/build
 /examples/*.html.png
 /examples/example-list.js
 /examples/example-list.xml