bugfix: fixed the Sec-WebSocket-Protocol header when the secondary protocols are specified. thanks woo for the report in #5.
fixed a test case.
feature: resty.websocket.client: added support for the "origin" option to specify the value of the Origin request header. thanks woo for the original patch in #5.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/resty/websocket/client.lua
fix websocket connect