Split boot.js in two to allow the env to be configured in between

This is mainly intended to support jasmine-browser-runner, which will load
a script that configures the env in between the two boot files (boot0.js and
boot1.js). The single-file boot.js is retained for now but will be removed
in a future release.

grunt/config/compress.js

@@ -29,7 +29,7 @@ module.exports = {
         cwd: libJasmineCore("")
       },
       {
-        src: [ "boot.js" ],
+        src: [ "boot0.js", "boot1.js" ],
         dest: standaloneLibDir,
         expand: true,
         cwd: libJasmineCore("boot")