* 'master' of github.com:rails/arel:
  replace 'LIMIT n' with 'FETCH FIRST n ROWS ONLY' when using ibm_db
  Generate more sqlish queue.

Passing nil in array generates improper SQL

replace 'LIMIT n' with 'FETCH FIRST n ROWS ONLY' when using ibm_db

Add support for specifying order direction on expressions

Conflicts:

	arel.gemspec

Conflicts:

	lib/arel.rb
	lib/arel/attributes/attribute.rb
	lib/arel/nodes/infix_operation.rb
	lib/arel/nodes/named_function.rb

Conflicts:

	lib/arel.rb
	lib/arel/attributes/attribute.rb

1st README example

Now, instead of the following SQL code:
  some_field IN (1, 2, NULL)

Arel will generate the proper one:
  some_field IN (1, 2) OR IS NULL

* 'master' of github.com:rails/arel:
  Make as factory method convert alias name to SqlLiteral
  Replace MathOperation with InfixOperation to support more operators

Propagates 'where' clauses when subquerying is triggered on the UpdateManager.

* 'master' of github.com:rails/arel:
  Add an #table_name method to Table and TableAlias, which always returns the actual table name, not the alias. Then fix ToSql#column_for to use this table name when checking whether the table exists (rather than before, where it was checking whether a table with the alias name exists, which was incorrect).