Replace submodule with package.json.

This is better, because now we can enumerate all of our dependencies without
embedding them as submodules. After pulling, run `npm install`.

.gitignore

-_site
\ No newline at end of file
+_site
+node_modules

.gitmodules

-[submodule "lib/uglify-js"]
-	path = lib/uglify-js
-	url = git://github.com/mishoo/UglifyJS.git

Makefile

-JS_COMPILER = \
-	./lib/uglify-js/bin/uglifyjs
+# See the README for installation instructions.
+
+JS_COMPILER = ./node_modules/uglify-js/bin/uglifyjs
+JS_TESTER = ./node_modules/vows/bin/vows
 
 all: \
 	d3.js \
@@ -188,7 +190,7 @@ d3.geom.js: \
 	src/end.js
 
 test: all
-	@vows
+	@$(JS_TESTER)
 
 %.min.js: %.js Makefile
 	@rm -f $@

README.md

@@ -28,3 +28,24 @@ built-in server:
     python -m SimpleHTTPServer 8888
 
 Once this is running, go to: <http://localhost:8888/examples/>
+
+### Development Setup
+
+This repository should work out of the box if you just want to create new
+visualizations using D3. On the other hand, if you want to extend D3 with new
+features, fix bugs, or run tests, you'll need to install a few more things.
+
+D3's test framework uses [Vows](http://vowsjs.org), which depends on
+[Node.js](http://nodejs.org/) and [NPM](http://npmjs.org/). If you are
+developing on Mac OS X, an easy way to install Node and NPM is using
+[Homebrew](http://mxcl.github.com/homebrew/):
+
+    brew install node
+    brew install npm
+
+Next, from the root directory of this repository, install D3's dependencies:
+
+    npm install
+
+You can see the list of dependencies in package.json. The packages will be
+installed in the node_modules directory.

uglify-js @ b6575ef0

-Subproject commit b6575ef0b658ab77d2247a88b995c2c623e9d6a7

package.json

+{
+  "name": "d3",
+  "version": "1.29.5",
+  "description": "A small, free JavaScript library for manipulating documents based on data.",
+  "keywords": ["dom", "w3c", "visualization", "svg", "animation", "canvas"],
+  "homepage": "http://mbostock.github.com/d3/",
+  "author": {"name": "Mike Bostock", "url": "http://bost.ocks.org/mike"},
+  "repository": {"type": "git", "url": "http://github.com/mbostock/d3.git"},
+  "dependencies": {
+    "uglify-js": "1.0.6",
+    "jsdom": "0.2.3",
+    "vows": "0.5.10"
+  }
+}