Replace ant with an npm-based build process

Re-organize the files to match standard node/npm conventions, and
use the `browserify` package to create bundles which are completely
backward-compatible with the bundles built with the previous process.

Fixes: #191

Author: cscott

.gitignore

@@ -1,6 +1,3 @@
-#Ignore timestamped build outputs.
-build/
-
 # Windows image file caches
 Thumbs.db
 
@@ -11,4 +8,5 @@ Desktop.ini
 .DS_Store
 
 # NPM files
-npm-debug.log
+npm-debug.log
+node_modules

.jshintrc

@@ -5,13 +5,14 @@
   "evil":       true,
   "forin":      true,
   "freeze":     true,
-  "latedef":    true,
+  "latedef":    "nofunc",
   "loopfunc":   true,
   "noarg":      true,
+  "node":       true,
   "nonew":      true,
+  "predef":     ["-SyntaxError"],
   "proto":      true,
-  "rhino":      false,
-  "strict":     "implied",
+  "strict":     true,
   "undef":      true,
   "unused":     "vars"
 }