Add full class definitions for Process, Queue, and Lock (#265)

These should be all the methods one can call on those classes

stdlib/3/multiprocessing/__init__.pyi

@@ -1,15 +1,41 @@
 # Stubs for multiprocessing
 
-from typing import Any
+from typing import Any, Callable, Iterable, Mapping
 
-class Lock(): ...
-class Process(): ...
+class Lock():
+    def acquire(self, block: bool = ..., timeout: int = ...) -> None: ...
+    def release(self) -> None: ...
+
+class Process():
+    # TODO: set type of group to None
+    def __init__(self,
+                 group: Any = ...,
+                 target: Callable = ...,
+                 name: str = ...,
+                 args: Iterable[Any] = ...,
+                 kwargs: Mapping[Any, Any] = ...,
+                 daemon: bool = ...) -> None: ...
+    def start(self) -> None: ...
+    def run(self) -> None: ...
+    def terminate(self) -> None: ...
+    def is_alive(self) -> bool: ...
+    def join(self, timeout: float = ...) -> None: ...
 
 class Queue():
-    def get(block: bool = ..., timeout: float = ...) -> Any: ...
+    def __init__(self, maxsize: int = ...) -> None: ...
+    def get(self, block: bool = ..., timeout: float = ...) -> Any: ...
+    def put(self, item: Any, block: bool = ..., timeout: float = ...) -> None: ...
+    def qsize(self) -> int: ...
+    def empty(self) -> bool: ...
+    def full(self) -> bool: ...
+    def put_nowait(self, item: Any) -> None: ...
+    def get_nowait(self) -> Any: ...
+    def close(self) -> None: ...
+    def join_thread(self) -> None: ...
+    def cancel_join_thread(self) -> None: ...
 
 class Value():
-    def __init__(typecode_or_type: str, *args: Any, lock: bool = ...) -> None: ...
+    def __init__(self, typecode_or_type: str, *args: Any, lock: bool = ...) -> None: ...
 
 # ----- multiprocessing function stubs -----
 def cpu_count() -> int: ...