Arty questions

• Is Facebooker for Rails still up to date and applicable for developing facebook applications?
• Using ftplib for multithread uploads
• Mongomapper: does "_id" field conflict with "id"?
• How to limit prediction probability to one class
• How to use regular expression in lxml xpath?
• How to use your own mysql database server with heroku?
• before_filter: is it possible to specify controller for action?
• Worldwide location (country, region, city) select plugin for Rails, jQuery or Google Maps API?
• How to do bundle install using specific rvm gemset from git hook post-receive?
• MongoDB 1.6.5: how to rename field in collection

Arty answers