Add db_schema_dump and db_schema_import rake tasks to work with the new ActiveRecord::SchemaDumper (for dumping a schema to and reading a schema from a ruby file).


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Added create_session_table, drop_session_table, and purge_session_table as rake tasks for databases that supports migrations (MySQL, PostgreSQL, SQLite) to get a table for use with CGI::Session::ActiveRecordStore. Added configuration of session options through config.session_options in Rails::Configuration

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2219 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Added dump of schema version to the db_structure_dump task for databases that support migrations #1835 [Rick Olson]

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Moved all the shared tasks from Rakefile into Rails, so that the Rakefile is empty and doesn't require updating. Added Rails::Initializer and Rails::Configuration to abstract all of the common setup out of config/environment.rb (uses config/boot.rb to bootstrap the initializer and paths)

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2115 5ecf4fe2-1ee6-0310-87b1-e25e094e27de