fixed bug in attribute deletion

Signed-off-by: Bernard `Guyzmo` Pratz <guyzmo+github@m0g.net>
added path support, and apikey checking

Signed-off-by: Bernard `Guyzmo` Pratz <guyzmo+github@m0g.net>
added EtherpadIO adapter

Signed-off-by: Bernard `Guyzmo` Pratz <guyzmo+github@m0g.net>