changed version

the first release should not have version 4

Signed-off-by: Sven Nierlein <sven@consol.de>
fix typo in debian/rules

lintian exception belongs to naemon-thruk-libs

Signed-off-by: Sven Nierlein <sven@consol.de>
fixed typo in debians postinst

url is /naemon obviously

Signed-off-by: Sven Nierlein <sven@consol.de>
autodetect apache configuration folder

with apache 2.4 a new configuration folder has been introduced, so use
that if available

Signed-off-by: Sven Nierlein <sven@consol.de>