add icon_url parameter to the slack payload options
allow the bot_icon setting to handle a url or emoji short name
Merge pull request #1 from jamescarlos/slack_icon_url

add icon_url/icon_emoji parameter to the slack payload options
Clean-up summary to avoid confusing Slack parser
Support bulk actions #2
Support bug columns as attachments #3
Update README.md

Add doc about plugin_Slack_columns.
Support bugnote editing and add translatable strings
Merge branch 'master' of https://github.com/infojunkie/MantisBT-Slack into upstream
Don't munge + chars
Don't munge + chars, part 2
Better handling of bug titles
Better display of existing config
Fix case of unassigned issue
Removed MIT license header
Add GPL header