Make it easier to perform database migrations using Warbler.

In order to perform database migrations on my machine I needed to do the following steps:
In the rails directory run "warble config"
add the following to the warble.rb file
config.includes = FileList["db/**/*", "Rakefile"]

run warbler

after deploying the war file going into the application/WEB-INF running a script that does the following:

echo "Setting gem home to \'`pwd`\'"
export GEM_HOME=`pwd`/gems/gems
echo "Running migration: $1"
java jar ./lib/jruby-complete* -rlib/derbyclient.jar -S rake $1

Where $1 is the migration you want to perform, such as db:migrate