Add @property setters for Cookie properties.
Merge pull request #176 from Abscissa/cookie-prop-setters

Add @property setters for Cookie properties.
Added an optional path argument to HttpServerRequest.setCookie(), defaulting to "/" to avoid setting multiple cookies with the same name.
Flagging the old Cookie.setX functions for deprecation.
Added IHttpRouter interface in vibe.http.router.
Modified UrlRouter to have it implement IHttpRouter
Renamed HTTP router interface from IHttpRouter to HttpRouter.
Added CookieValueMap as a means to handle multiple cookies with the same name while keeping the interface compatible.

See issue #174 for discussion.
Small refactoring of the cookie Cookie class.
Added arguments for specifying the cookie path and secure attributes in startSession().

See also issue #174.
Merge pull request #177 from bluepeppers/IHttpRouter

Added HttpRouter interface
Fixed terminateSession() to specify the same "path" and "secure" attributes when clearing out the cookie.

See also issue #174.
Renamed IHttpServerRequestHandler to HttpServerRequestHandler to comply with the latest style practice.

See also pull #177.