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

This approach eliminates necessity to guess model name by file name that
allow to process models with any kind of non-standard capitalization in
class and module names. Though, it still requires that underscored file
name matches underscored model class name. If file is located not at the
top level of models directory then we assume that model is either nested
in the corresponding chain of modules or is not nested at all.

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