Bumped version number for develop
Added branch to contrib notes
Use smaller image link
Ignore unrecognised data in old configs

This handles the case of using a config file from a different version of mpsyt.
Fix add many to playlist saves file repeatedly
log unrecognised config items
PEP cleanup
fix encoding issue
Add the overwrite true|false option.

This option, if set to true, will overwrite existing downloaded files
but if set to false, will skip downloads for which there are existing
files in the current download directory. This allows for quickly
downloading new files in a playlist while ignoring the ones that are
already downloaded.
adding support for notifiers
removing unnecessary import
Merge remote-tracking branch 'origin/pr/93' into develop
Fix order of help set topics
use subprocess.call for notifier, don't depend on mplayer
fix notifier bug with shell=True
Merge remote-tracking branch 'origin/pr/95' into develop-pr95
fix notify command doesn't work with ' char
remove unnecessary print
Exit with correct status code
Added clipboard copy feature (request #97)