feat(etcd_handlers): add the dashboard URL

/dashboard serves a dashboard now
feat(dashboard/README): initial commit
feat(dashboard): Initial commit of frontend code
bump(github.com/jteeuwen/go-bindata): 79847ab3e91ae5d2e1b18796c1795c78f29565d7
feat(dashboard): inital commit of resources package
feat(dashboard): introduce the in memory handler

the in memory handler gives etcd the ability to serve a dashboard
without on disk resources. This is the first time we are using the
/mod/ path too.

TODO: cleanup the mod stuff so it isn't hacked into etcd_handlers.
fix(dashboard): add d3 to bower
fix(dashboard): add moment to bower dependencies
chore(dashboard): move to the mod directory
feat(mods): add README file
feat(mod): introduce the /etcd/mod namespace

introduce the `/etcd/mod` namespace and add the dashboard into it.
feat(mod/dashboard): add cleaner urls for stats and browser

you can hit them at:

- http://localhost:4001/etcd/mod/dashboard/stats
- http://localhost:4001/etcd/mod/dashboard/browser
Merge pull request #207 from philips/integrate-dashboard

New dashboard as module