WebPages component installer

[borsi]

Create an SnAdmin package which you can use the installer with.

Acceptance criteria

• [ ] With the installer, choosing the package option in the beginning, I can install the WebPages component on my existing SenseNet instance.
• [ ] In this installed component there is a welcome page with a login portlet on it
• [ ] The installed component has a working content explorer where you can create pages
• [ ] There is a getting started guide which guides through the user the installation of the webpages (and the services) component