remove couchd as development dependency
update to NetLogoLite v5.0.4
ignore public/ directory
replace rails with simple rack-based server

Also temporarily add rack-rewrite to rewrite requests for
resources at older locations

This could instead be done in an Apache configuration
just on the servers we maintain. These are the only live
instances of Lab that need these rewrites.
replace server/public/ with public/
move server settings to config/config.yml

So far hostname is the only necessary setting.
Remove dependency on activesupport gem.

use ERB to make html safe strings

Part of work to simplify external dependencies.

ERB is part of Ruby standard library.
mml paths no longer have leading slashes ??
remove server dir, now in separate repo

see:
https://github.com/concord-consortium/lab-interactive-management
Readme: updates for removal of 'server/'

Also link gh-pages script to updated readme section
rackup config: change name for Passenger recognition
remove server tasks from capistrano
cap <target> deploy:update: runs make, instead of make public