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Injects text right after the class definition. Since it depends on
insert_into_file, it's reversible.

==== Parameters
path<String>:: path of the file to be changed
klass<String|Class>:: the class to be manipulated
data<String>:: the data to append to the class, can be also given as a block.
config<Hash>:: give :verbose => false to not log the status.

==== Examples

  inject_into_class "app/controllers/application_controller.rb", ApplicationController, "  filter_parameter :password\n"

  inject_into_class "app/controllers/application_controller.rb", ApplicationController do
    "  filter_parameter :password\n"
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