1. You will need to install json gem! 
   sudo gem install json
2. for testing, you need flexmock gem
3. memory_cache is giving us some grief, so add this to config/wagn.rb
   ActionController::Base.fragment_cache_store = :file_store
   (mem_cache also works, if you've got it installed)
4. fulltext search is now supported in postgres (see below)
   

Installing postgres fulltext search

1. install tsearch2
   cd $PSQL_SRC_DIR/contrib/tsearch2/
make
sudo make install
   

   sudo -u postgres make installcheck
   

2. configure wagn.rb
   System.enable_postgres_fulltext = true
System.postgres_src_dir = "$PSQL_SRC_DIR"
3. rake wagn:prepare_fulltext
   this step makes a number of assumptions- that you have sudo permissions,
   there is a user postgres with priveleges to add c-functions to the db. etc.
   if these cause trouble, edit lib/tasks/prepare_fulltext.rake