Be more specific on checking sqlite $LOADED_FEATURES

[Erik Persson]

$LOADED_FEATURES.grep( /sqlite3/ )

irb(main):001:0> $LOADED_FEATURES.grep( /sqlite3/ )
=> ["/opt/local/lib/ruby/gems/1.8/gems/composite_primary_keys-2.2.2/lib/composite_primary_keys/connection_adapters/sqlite3_adapter.rb"]