Whitelist methods that can be invoked by meta-channel messages, to prevent messages invoking arbitrary object methods. Also stop Ruby's Channel.parse() from creating symbols from user input.
Bump version to 0.8.7.
Bump version to 0.8.8.
Merge branch 'meta-whitelist'

Conflicts:
	javascript/protocol/server.js
	lib/faye.rb
	lib/faye/protocol/channel.rb
	lib/faye/protocol/server.rb
	site/src/pages/download.haml
	spec/javascript/server_spec.js