update require
Merge branch 'master' of github.com:component/builder.js
Default urlPrefix to empty string. Fixes #75
Merge pull request #76 from timoxley/bug/0.10-path

Default builder.urlPrefix to empty string.
Merge branch 'master' of github.com:component/builder.js
Release 0.6.4
Merge branch 'master' of github.com:component/builder.js into conf-race