Expose Metadata

Added access to:
* `/users/@me/guilds`
* `/guilds/{guild_id}`
* `/guilds/{guild_id}/members/{member_id}`

BREAKING CHANGE:
* `get_user_info` -> `fetch_user_info` to match naming scheme.

Remove useless note

Remove `reverse` and corresponding documentation

Update documentation to reflect #1988

Rename `get_` HTTP functions to `fetch_`

Breaking Changes:
* `get_message` -> `fetch_message`
* `get_invite` -> `fetch_invite`
* `get_user_profile` -> `fetch_user_profile`
* `get_webhook_info` -> `fetch_webhook`
* `get_ban` -> `fetch_ban`

Fix InviteConverter, update migrating.rst

Rename get_message to fetch_message

discord/guild.py

@@ -944,7 +944,32 @@ class Guild(Hashable):
         fields['explicit_content_filter'] = explicit_content_filter.value
         await http.edit_guild(self.id, reason=reason, **fields)
 
-    async def get_ban(self, user):
+    async def fetch_member(self, member_id):
+        """|coro|
+
+        Retreives a :class:`Member` from a guild ID, and a member ID.
+
+        Parameters
+        -----------
+        member_id: :class:`int`
+            The member's ID to fetch from.
+
+        Raises
+        -------
+        Forbidden
+            You do not have access to the guild.
+        HTTPException
+            Getting the guild failed.
+
+        Returns
+        --------
+        :class:`Member`
+            The member from the member ID.
+        """
+        data = await self._state.http.get_member(self.id, member_id)
+        return Member(data=data, state=self._state, guild=self)
+
+    async def fetch_ban(self, user):
         """|coro|
 
         Retrieves the :class:`BanEntry` for a user, which is a namedtuple