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

(For example, the Zookeeper gem...)

Integrate various fixes around finding model classes, including https://github.com/ctran/annotate_models/pull/82 and https://github.com/ctran/annotate_models/pull/85

By default, ObjectSpace.each_object is disabled in JRuby. However,
ObjectSpace.each_object(Class) still works.

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

Conflicts:

	lib/annotate/annotate_models.rb