Removed the monkey patch of add_foreign_key

[jimgrimmett]

The function prototype in the money patch is:
def add_foreign_key(referencing_table_name, referencing_field_name, referenced_table_name, referenced_field_name = :id)

The function protoype in ActiveRecord is:
def add_foreign_key(to_table, options)

This means that many of the documented ways to call add_foreign_key in a migration do not work.

Please feel free to tell what I am missing here and suggest a better solution, but with this change in place, everything is working again.

[jakub-tokaj-ah]

@jimgrimmett thanks for the PR, but as the repository readme says: https://github.com/AirHelp/partitioned#this-fork-is-no-longer-maintained

We are no longer maintaining this fork. If you need some functionality feel free to create and maintain your own.