write area to DOM

this can for example be used to write area specific CSS
dont hghlight tile buttons by default
Fix ret_status for force_path=''

d54224d3c977850f5a1424e3b544786d6b11f70f and friends led to
instance.join passing an empty string to `force_path`, which makes the
join redirect fail.
create sysvinit script to make automatic deployment work better.
compass: set encoding to prevent encoding error when compiling css files with unicode
rename controller helper method user.show
refactor user.show overlay checks
Set c.instances in controllers.user._show_common (fixes #751)

This makes the instance selector work in the user profile about tab.

More refactoring could be done here.
Readd legacy user.show controller

Fixup f8da12d44001c5a0a6bfcc8a367e420da09a0bcf