Updated readme with info about PowerEnum 2.X.
Specifying license in gemspec.
Follow API for migration number methods.

The original methods are established in
railties/lib/rails/generators/migration.rb
Use named base as a template.

This reduces the amount of customization that power enum adds to its
generator and allows for the migration_template helper to do its job of
detecting and removing an existing template for the same migration.
Merge branch 'conform_to_model_generators' of git://github.com/zbelzer/power_enum into zbelzer-conform_to_model_generators

Conflicts:
	README.markdown
	VERSION
	power_enum.gemspec