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scrogson 
Update OAuth2.Client.get_token! errors (#98)

* Update OAuth2.Client.get_token! errors

Updates the `OAuth2.Client.get_token!` function to handle error OAuth2.Response structs. I sent some incomplete data to Facebook Graph and saw this error bubble up:

```
[error] %ArgumentError{message: "raise/1 expects a module name, string or exception as the first argument, got: %OAuth2.Response{body: %{\"error\" => %{\"code\" => 101, \"fbtrace_id\" => \"Eelth+pfiU9\", \"message\" => \"Missing client_id parameter.\", \"type\" => \"OAuthException\"}}, headers: [{\"www-authenticate\", \"OAuth \\\"Facebook Platform\\\" \\\"invalid_client\\\" \\\"Missing client_id parameter.\\\"\"}, {\"access-control-allow-origin\", \"*\"}, {\"pragma\", \"no-cache\"}, {\"cache-control\", \"no-store\"}, {\"x-fb-rev\", \"3349395\"}, {\"content-type\", \"application/json\"}, {\"x-fb-trace-id\", \"Eelth+pfiU9\"}, {\"facebook-api-version\", \"v2.8\"}, {\"expires\", \"Sat, 01 Jan 2000 00:00:00 GMT\"}, {\"x-fb-debug\", \"9GWPCrYAIzlrSnt0iLqP/3E4hdmOJpP7QXxBOXTG2Ew7CloqVwka+HXAjyCTewfTaH0F/sUVkDLMcm7+6jOEEQ==\"}, {\"date\", \"Thu, 05 Oct 2017 15:36:54 GMT\"}, {\"connection\", \"keep-alive\"}, {\"content-length\", \"114\"}], status_code: 400}"}
```

Using `OAuth2.Request.request!` as a model, I added a similar error handling case to `OAuth2.Client.get_token!`. Now the error raised looks like:

```
[error] #PID<0.1063.0> running ExampleOAuth2Web.Endpoint terminated
Server: oauth2.example.dev:80 (http)
Request: POST /
** (exit) an exception was raised:
    ** (OAuth2.Error) Server responded with status: 400

Headers:

www-authenticate: OAuth "Facebook Platform" "invalid_client" "Missing client_id parameter."
access-control-allow-origin: *
pragma: no-cache
cache-control: no-store
x-fb-rev: 3349509
content-type: application/json
x-fb-trace-id: CIc8eDTN/BC
facebook-api-version: v2.8
expires: Sat, 01 Jan 2000 00:00:00 GMT
x-fb-debug: wJzExwqDXtAkHKtBNo4xKE21zBO730qctNXaP... (continued)

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