Changed change_column in PG schema_statements.rb to make sure that the uuid_generate function was not being quoted
Merge branch '4-0-stable' of https://github.com/eric-chahin/rails into 4-0-stable

Conflicts:
	activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
	activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb