add module name option for generator commands to support #855

Created by: munza

add —module (-m) option for administrate generators that will create generated file under the specified module name. eg. rails g administrate:install -m Manage.

This will solve the problem if anyone already has a model named Admin in their application and wish to use a different module name other than the default Admin module of the Administrate.

We can now use the --module (-m as shorthand) and then specify the module name we wish to use in the generator command like below -

• rails g administrate:install -m Manage
• rails g administrate:dashboard Foo -m Manage etc.

We can then see that the generated files are using the specified Manage module instead of the default Admin module namespacing.