add community intro
Merge branch 'new-design' into v2.0
bump version to 2.0.0.alpha
fix width on large screen

limit max-width to 970px
limit content width further
fix comment form width problem
add community intro
bump version to 2.0.0.alpha
major refactoring for plane/node/topic

1. drop planes table
2. node is not required for creating topic
3. topic has many nodes
change migration orders to migrate topic/node
add public/uploads dir
fix bug: remove quiet node feature for now
update layout

move logo to the left
use rubygems.org as gem sourse

and upgrade facebox-rails
Merge branch 'v2.0'

Conflicts:
	Gemfile
	Gemfile.lock