changing to get rid of deprecation warnings

if column limit is an array, the values are serialilzed into column attr
  cf enum_column3 gem

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

WARNING: EVIL MERGE!

I had to update the test cases to match the current reality...

Conflicts:

	annotate.gemspec
	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.