Ruby 2.0 compatibility: remove implicit conversion of nil into String
Update Gemfile to use HTTPS requests

The source :rubygems is deprecated because HTTP requests are insecure.
Add Ruby 2.0 to Travis
Remove unused ProviderSelection code
remove unused untested controller api/environments
Merge pull request #420 from martinpovolny/remove_api_environments

remove unused untested controller api/environments
Merge pull request #419 from ifarkas/remove_unused_provider_selection_code

Remove unused ProviderSelection code
code style cleanup in models
Merge pull request #418 from ifarkas/ruby2.0-compatibality

Fix Ruby 2.0 compatibility issues
Merge pull request #422 from martinpovolny/coding_style

code style cleanup in models
Remove unused utils/conductor code
Merge pull request #423 from ifarkas/remove_unsued_methods_from_utils_conductor

Remove unused utils/conductor code
Enable slow query warnings in development environment

This feature was introduced in Rails 3.2 and is enabled by default in new projects.
Merge pull request #428 from ifarkas/auto_explain

Enable slow query warnings in development environment
Gettext conversion - last t-keys (with count and interpolation)
Updated PO/POT files
Move configuration of Gettext

Moved Gettext config from application.rb to initializers/fast_gettext.rb
and added default available languages.