Remove unused requires from app and unused mime module from dev bundle.

I'm not bothering to increment and build the dev bundle; fine with this just
getting rolled into whatever the next build is.

admin/generate-dev-bundle.sh

@@ -83,7 +83,6 @@ npm install coffee-script@1.5.0
 npm install less@1.3.3
 npm install stylus@0.30.1
 npm install nib@0.8.2
-npm install mime@1.2.7
 npm install semver@1.1.0
 npm install handlebars@1.0.7
 npm install mongodb@1.1.11

app/server/server.js

@@ -9,8 +9,6 @@ var url = require("url");
 var connect = require('connect');
 var gzippo = require('gzippo');
 var argv = require('optimist').argv;
-var mime = require('mime');
-var handlebars = require('handlebars');
 var useragent = require('useragent');
 
 var _ = require('underscore');