Separate the plugin repository from the project repository

[FabricioMSantos]

Make a repository just for the project and use this repository for the plugin, then add the plugin repository as a git submodule on the project repository.
This will make it easier to add the plugin to other projects as a git submodule and keep the plugin updated.

Example of a project doing this:
https://github.com/sinbad/SPUDExamples
https://github.com/sinbad/SPUD