Log Message:
Update ruby-arel package to 2.0.8.

== 2.0.8  / 2010/02/08

* Bug Fixes

  * Added set operation support
  * Fixed problems with *_any / *_all methods.

== 2.0.7 (unreleased)

* Bug Fixes

  * Limit members are visited
  * Fixing MSSQL TOP support

== 2.0.6 12/01/2010

* Bug Fixes

  * Rails 3.0.x does not like that Node is Enumerable, so removing for now.

== 2.0.5 11/30/2010

* Enhancements

  * Arel::Visitors::DepthFirst can walk your AST depth first
  * Arel::Nodes::Node is enumerable, depth first

* Bug fixes

  * #lock will lock SELECT statements "FOR UPDATE" on mysql
  * Nodes::Node#not factory method added for creating Nodes::Not nodes
  * Added an As node

* Deprecations

  * Support for Subclasses of core classes will be removed in ARel version
    2.2.0

== 2.0.4

* Bug fixes

  * Speed improvements for Range queries.  Thanks Rolf Timmermans!

== 2.0.3

* Bug fixes

  * Fixing Oracle support
  * Added a visitor for "Class" objects

== 2.0.2

* Bug fixes

  * MySQL selects from DUAL on empty FROM
  * Visitor translates nil to NULL
  * Visitor translates Bignum properly

== 2.0.1

* Bug fixes

== 2.0.0 / 2010-08-01
* Enhancements

  * Recreate library using the Visitor pattern.
    http://en.wikipedia.org/wiki/Visitor_pattern