Create the Relax extension

[Nicklas Nordborg]

This ticket is for collecting all work that is required for setting up a development environment for the Relax extension.

[Nicklas Nordborg]

(In [4347]) References #941: Create the Relax extension

Created main repository for the Relax extension.

[Nicklas Nordborg]

(In [4348]) References #941: Create the Relax extension

Created trunk, tags and branches folders for the Relax extension.

[Nicklas Nordborg]

(In [4349]) References #941: Create the Relax extension

Added all basic files that are needed to build and install the extension in BASE.

[Nicklas Nordborg]

(In [4401]) References #941: Create the Relax extension

Use the active roles to decide if the admin menu should be active or not.

[Nicklas Nordborg]

(In [4476]) References #941. Reggie -> Relax