Enable logging to syslog, optionally with debug
Update log levels to only display relevant killswitch addition/removal and important warnings
Use g_message() rather than g_info() for standard messages.

Signed-off-by: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com>
Merge pull request #7 from cyphermox/logging

Support logging to syslog