flesh out production install details
Merge pull request #163 from mreiferson/install_doc

improved install docs
all: make code go gettable by avoiding relative imports

Fix #166.
Merge pull request #167 from fsouza/master

use absolute imports, so nsq is go gettable
add logo
Merge pull request #168 from mreiferson/logo_168

add logo
Merge branch 'master' of git://github.com/bitly/nsq