chore: Fix examples not working with `cargo run` (#998)

* chore: Fix examples not working with `cargo run`

## Motivation

PR #991 moved the `tokio` crate to its own subdirectory, but did not
move the `examples` directory into `tokio/examples`. While attempting to
use the examples for testing another change, I noticed that #991 had
broken the ability to use `cargo run`, as the examples were no longer
considered part of a crate that cargo was aware of:

```
tokio on master [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev
➜  cargo run --example chat
error: no example target named `chat`

Did you mean `echo`?
```

## Solution

This branch moves the examples into the `tokio` directory, so cargo is
now once again aware of them:

```
tokio on eliza/fix-examples [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev
➜  cargo run --example chat
   Compiling tokio-executor v0.1.7 (/Users/eliza/Code/tokio/tokio-executor)
   Compiling tokio-reactor v0.1.9
   Compiling tokio-threadpool v0.1.13
   Compiling tokio-current-thread v0.1.6
   Compiling tokio-timer v0.2.10
   Compiling tokio-uds v0.2.5
   Compiling tokio-udp v0.1.3
   Compiling tokio-tcp v0.1.3
   Compiling tokio-fs v0.1.6
   Compiling tokio v0.1.18 (/Users/eliza/Code/tokio/tokio)
    Finished dev [unoptimized + debuginfo] target(s) in 7.04s
     Running `target/debug/examples/chat`
server running on localhost:6142
```

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

1 files changed, 0 insertions, 60 deletions

diff --git a/examples/README.md b/examples/README.md
deleted file mode 100644
index 63634c82..00000000
--- a/examples/README.md
+++ /dev/null
@@ -1,60 +0,0 @@
-## Examples of how to use Tokio
-
-This directory contains a number of examples showcasing various capabilities of
-the `tokio` crate.
-
-All examples can be executed with:
-
-```
-cargo run --example $name
-```
-
-A high level description of each example is:
-
-* [`hello_world`](hello_world.rs) - a tiny server that writes "hello world" to
-  all connected clients and then terminates the connection, should help see how
-  to create and initialize `tokio`.
-
-* [`echo`](echo.rs) - this is your standard TCP "echo server" which accepts
-  connections and then echos back any contents that are read from each connected
-  client.
-
-* [`print_each_packet`](print_each_packet.rs) - this server will create a TCP
-  listener, accept connections in a loop, and put down in the stdout everything
-  that's read off of each TCP connection.
-
-* [`echo-udp`](echo-udp.rs) - again your standard "echo server", except for UDP
-  instead of TCP.  This will echo back any packets received to the original
-  sender.
-
-* [`connect`](connect.rs) - this is a `nc`-like clone which can be used to
-  interact with most other examples. The program creates a TCP connection or UDP
-  socket to sends all information read on stdin to the remote peer, displaying
-  any data received on stdout. Often quite useful when interacting with the
-  various other servers here!
-
-* [`chat`](chat.rs) - this spins up a local TCP server which will broadcast from
-  any connected client to all other connected clients. You can connect to this
-  in multiple terminals and use it to chat between the terminals.
-
-* [`chat-combinator`](chat-combinator.rs) - Similar to `chat`, but this uses a
-  much more functional programming approach using combinators.
-
-* [`proxy`](proxy.rs) - an example proxy server that will forward all connected
-  TCP clients to the remote address specified when starting the program.
-
-* [`tinyhttp`](tinyhttp.rs) - a tiny HTTP/1.1 server which doesn't support HTTP
-  request bodies showcasing running on multiple cores, working with futures and
-  spawning tasks, and finally framing a TCP connection to discrete
-  request/response objects.
-
-* [`tinydb`](tinydb.rs) - an in-memory database which shows sharing state
-  between all connected clients, notably the key/value store of this database.
-
-* [`udp-client`](udp-client.rs) - a simple `send_dgram`/`recv_dgram` example.
-
-* [`manual-runtime`](manual-runtime.rs) - manually composing a runtime.
-
-If you've got an example you'd like to see here, please feel free to open an
-issue. Otherwise if you've got an example you'd like to add, please feel free
-to make a PR!