Issue #405: serve external static assets from embedded server

Initial commit of dispatching static assets

Initial application of go-bindata to assets

The go-bindata project at:
https://github.com/jteeuwen/go-bindata

converts a directory tree of assets into an embedded zip file and some
attendant functions to retrieve singular assets out of the zip
file. Useful in that it's hard to fully resolve internal references
within bootstrap and jquery.

Only allow GETs of embedded assets

Minor tweaks based upon PR code review

N.b. regenerated bindata.go to remove jquery-1.10.1, updated templates

Corrected package of bindata.go

Make use of embedded assets the default behavior

Remove dead code from templates package, run fmt.sh
Merge pull request #406 from crossjam/builtin_assets

issue #405 - nsqadmin: Adapting bootstrap/jquery resources for behind a firewall