Fixed -l option

Print an error message when invalid loglevel value is provided
Exit with an error code
Merge pull request #56 from swaeku/master

Inform user when invalid loglevel is provided in command line options
Uses portable end of line instead of \n in error message
Print error messages on stdandard error instead of standard output
Improved option -x support

Print an error message when the command doesn't exist
Exit with an error code instead of 0
Merge pull request #57 from swaeku/master

Improved error messages
hide feeds when the title starts with !
forgot scope
Merge pull request #58 from gs93/hide_feeds

Hide feeds
add documentation about hidden feeds.
added "openbrowser-and-mark-jumps-to-next-unread" option
added "toogleitemread-jumps-to-next-unread" option
added "markfeedread-jumps-to-next-unread" option
fixed format
updated keys
fixed typo
fixed little bug
Add a DL_READY state to downloaded yet unplayed files so they won't get purged before being played
Merge pull request #62 from skn/upstream

Updated Pinboard bookmarking script
Merge pull request #61 from cheloizaguirre/podbeuter_add_ready_state

Add a DL_READY state to podbeuter to downloaded yet unplayed files