add logging output for pushover agent
add logging output for pushover agent

for debugging purposes there should be a logging output. however the pushover does not have a log output. i added a simple logging output.
dsander/huginn,strugee/huginn,Ishfal/huginn,naiyt/huginn,eugenesvk/huginn,eugenesvk/huginn,strugee/huginn,cantino/huginn,gautamkrishnar/huginn,breandan/huginn,huginn/huginn,brianpetro/huginn,eugenesvk/huginn,huginn/huginn,virtadpt/huginn,gautamkrishnar/huginn,cantino/huginn,mathias/huginn,huginn/huginn,virtadpt/huginn,Ishfal/huginn,strugee/huginn,naiyt/huginn,naiyt/huginn,cantino/huginn,dsander/huginn,gautamkrishnar/huginn,breandan/huginn,mathias/huginn,Ishfal/huginn,dsander/huginn,breandan/huginn,virtadpt/huginn,brianpetro/huginn,brianpetro/huginn,mathias/huginn