Add "Report an issue" in Contributing.asciidoc
Remove script invitedby.rb (closes #2)

The script is moved to unofficial scripts.
New script responsive_layout.py: automatically apply layouts according to terminal size
New script shutup.py: replace text from specified IRC users with random or preset text
pushover.pl 0.5

* add NMA support
* add option "priority"
* display error if API call fails
* don't notify if message was filtered
Merge branch 'pushover.pl' of https://github.com/stfnm/weechat-scripts-official
Merge branch 'master' of https://github.com/weechat/scripts