setup for production
new icons
Update README.md
clean up variables (filter + target)
Read chats show as read when replied to

Addresses problem of chats being shown as unread even though they are read.
Update facesnoop.js
Sends new AJAX request when send_messages is called

Still not complete and working. Need to find out what to put as the argument for .send function.
Variable stops AJAX call being cancelled

Global variable which stops AJAX call being cancelled put in place. More elegant solution for future needed.
Clarity through comments
Set header of AJAX call, set asynchronous call as false

For POST type, header needs to be set in order for the server to know what to do with the uploaded content.
Asynchronous call set to false because response is wanted immediately.
Firefox.js
Merge branch 'prod' of https://github.com/pranavanand123/facesnoop
Structure for xhr cancel