remove expections that do not raise_error with SpecificErrorClasses, remove old should expections and replace with new syntax
Default config/database.yml needs to be fetched from the pwd
Add binstubs
Bump to 1.2.4

Concerns #19
Fix specs
Fix bug with older versions of ActiveRecord

`ActiveRecord::Migrator.migrations_path` exists in all versions of
ActiveRecord, so we should better use that.

Fixes #20
Bump to 1.2.5
Flickr handle: @m_janko => @jankomarohnic
Bump to 1.3

Concerns #12
Update README to include new rake tasks

This commit merely adds the rake tasks to the README list that were added in #12, including create, drop, seed and setup.