Merge pull request #8 from dedeckeh/bugfixes

Don't rearm RS timer if callback is not set
Fix prefix detection for hybrid mode
Fix a segfault in state-script handling
Use hybrid management mode by default
Fix logging verbosity
Don't enable relay master if no slaves are present
Fix memory corruption when reloading static leases
Fix another memory corruption
Merge remote branch 'upstream/master' into bugfixes
Merge remote branch 'upstream/master' into bugfixes
Fix ra_management and ndproxy_routing config overwrite

Set default values for the ra_management and ndproxy_routing
config parameters if no attributes are present and overwrite is
to true.