Add a generator (annotate_models:install) to install a Rakefile that automatically annotates models when db:migrate is invoked.

Recognize column+type, and don't change a file unless the column+type combination of the new schema are different than that of the old (i.e., don't regenerate if columns happen to be in a different order. That's just how life is sometimes)
Grab old specification even if it has \r\n as line endings rather than pure \ns
Remove gemspec line causing a warning

 * NOTE: Gem::Specification#default_executable= is deprecated with no replacement. It will be removed on or after 2011-10-01.

Add support for factory_girl and move default annotation position to top.  Also updated documentation files.