Fixes #468.

Rename lib/tasks/migrate.rake something more unique to avoid conflicts.

* Prevent root_dir option from being empty

When setting root_dir to an empty string (as is done in the default rake
task config) this line previously caused root_dir to become an empty
array.

This in turn caused factories, specs etc not to be annotated.

This is just a quick band-aid on a larger problem. We have option
parsing spread out over many different places, with slight mismatches
like this in the assumptions made.

* Handle blank values & comma-separated strings in AnnotateModels.root_dir

These cases are currently handled (inconsistently) in the different
option parsing routines.

* Pass root_dir forward unmodified

The different cases are now handled inside AnnotateModels

* add option to exclude STI subclasses from annotation

Reduced the Cyclomatic complexity.
#330 By default didn't annotate activeadmin models.
This close #330

Do not annotate controllers, helpers and scaffolds by default (revert to behavior from previous version)

[ fixes #252 ]

Add option for classified annotation (id first, timestamps/assotiactions last)

require activesupport core extension .blank?

Add option for classified annotation (id first, timestamps/assotiactions last)

Fix bug

Restore gemspec file

Add configurable for routes position, ability to remove routes, fix handling of output from newer Rake versions.

This reverts commit 8d3c00c7.

Sorry, but database order should be the default unless a user really wants it alphabetized. (We should also allow a .annotate file so users can set their own preferred options more easily.)

Conflicts:

	.gitignore
	bin/annotate
	lib/annotate/annotate_models.rb
	lib/tasks/annotate_models.rake

Annotation position defaulted to 'before'. Bugfix: annotate_models.rake uses string instead of symbol.

Fix options parsing to convert strings to proper booleans. Change annotate to use options hash instead of ENV.