Separate colour tuple into its own class.

Also enumerate all the constant colours that Discord currently
supports.

discord/server.py

@@ -25,59 +25,8 @@ DEALINGS IN THE SOFTWARE.
 """
 
 from .user import User
-from .permissions import Permissions
 from .utils import parse_time
 
-class Role(object):
-    """Represents a Discord role in a :class:`Server`.
-
-    Instance attributes:
-
-    .. attribute:: id
-
-        The ID for the role.
-    .. attribute:: name
-
-        The name of the role.
-    .. attribute:: permissions
-
-        A :class:`Permissions` that represents the role's permissions.
-    .. attribute:: color
-                   colour
-
-        A tuple of (r, g, b) associated with the role colour.
-    .. attribute:: hoist
-
-        A boolean representing if the role will be displayed separately from other members.
-    .. attribute:: position
-
-        The position of the role.
-    """
-
-    def __init__(self, **kwargs):
-        self.update(**kwargs)
-
-    def update(self, **kwargs):
-        self.id = kwargs.get('id')
-        self.name = kwargs.get('name')
-        self.permissions = Permissions(kwargs.get('permissions', 0))
-        self.position = kwargs.get('position', -1)
-        self.colour = kwargs.get('color', 0)
-        self.hoist = kwargs.get('hoist', False)
-        self._colour_to_tuple()
-
-    def _colour_to_tuple(self):
-        # first we turn this into a hex string
-        # the reason why we're using a hex string rather than just use bitwise
-        # ops is because we don't want to care too much about endianness.
-        hex_str = format(self.colour, '06x')
-        red = int(hex_str[0] + hex_str[1], base=16)
-        green = int(hex_str[2] + hex_str[3], base=16)
-        blue = int(hex_str[4] + hex_str[5], base=16)
-        self.colour = (red, green, blue)
-        self.color = self.colour
-
-
 class Member(User):
     """Represents a Discord member to a :class:`Server`.