Bundle subdir themes

Purpose:
This subdir may optionally contain theme files which either replace part of the
theme or add files to the theme provided as default for ScientificCMS and this
way adopt the theme for site specific design. 

All files and subdirectories all copied asis to the applications ~/themes 
directory in its document (context) root.

It is the responsibility of developer / system integrator to ensure all files
are copied to the right location and the theme works with the modification. No
functionality or consistency check is perfordmed!