Add support for Rails 3 migrations
Bump version to 0.1.0 and create version.rb
Make testing easier, and expand README with instructions
Prevent rename_column from raising exception

Previously, rename_column was not initializing a variable that was
referenced, causing an exception to occur when used with regular
migrations.
Merge pull request #3 from analog-analytics/master

Add Rails 3 support and raise version to 0.1.0