add support of primary_key option
update to work with rails 3
mv tasks/* to lib/tasks/ for rails3
replace RAILS_ROOT to Rails.root for rails3
Version bump to 1.0.0
gem version 1.0
Regenerate gemspec for version 1.0.0
Version bump to 1.1.0
add rake task load
Regenerate gemspec for version 1.1.0
Merge remote-tracking branch 'subicura/master'