by x7ian: added module_load_include() for the file mobile_navigation.inc to avoid an error that sometimes showeed up saying functions in that file not found. Not sure why error was showing someting and sometimes not.
Ostensibly sending the right error levels to Opbeat.
Currently, everything is displayed with level “error” on Opbeat.com,
no matter what we send from our end. But according to their docs, this
should be right (famous last words).