upgrade go 1.7 ctxhttp to req.WithContext

[stanxii]

Upgrage ctxhttp to go 1.7 Context.

[stanxii]

why my local envierment go 1.8 go test is ok?
$ go test -v
=== RUN TestHTTPClient
--- PASS: TestHTTPClient (0.00s)
=== RUN TestHTTPClientBufferedStream
--- PASS: TestHTTPClientBufferedStream (0.00s)
=== RUN TestClientFinalizer
--- PASS: TestClientFinalizer (0.00s)
=== RUN TestEncodeJSONRequest
--- PASS: TestEncodeJSONRequest (0.01s)
=== RUN TestSetHeader
--- PASS: TestSetHeader (0.00s)
=== RUN TestSetContentType
--- PASS: TestSetContentType (0.00s)
=== RUN TestServerBadDecode
--- PASS: TestServerBadDecode (0.00s)
=== RUN TestServerBadEndpoint
--- PASS: TestServerBadEndpoint (0.00s)
=== RUN TestServerBadEncode
--- PASS: TestServerBadEncode (0.00s)
=== RUN TestServerErrorEncoder
--- PASS: TestServerErrorEncoder (0.00s)
=== RUN TestServerHappyPath
--- PASS: TestServerHappyPath (0.00s)
=== RUN TestMultipleServerBefore
--- PASS: TestMultipleServerBefore (0.00s)
=== RUN TestMultipleServerAfter
--- PASS: TestMultipleServerAfter (0.00s)
=== RUN TestServerFinalizer
--- PASS: TestServerFinalizer (0.00s)
=== RUN TestEncodeJSONResponse
--- PASS: TestEncodeJSONResponse (0.00s)
=== RUN TestEncodeNoContent
--- PASS: TestEncodeNoContent (0.00s)
=== RUN TestEnhancedError
--- PASS: TestEnhancedError (0.00s)
=== RUN ExamplePopulateRequestContext
--- PASS: ExamplePopulateRequestContext (0.00s)
PASS
ok github.com/stanxii/kit/transport/http 0.147s

[peterbourgon]

Flaky test, fixed now. Thanks!

[stanxii]

@peterbourgon You are welcome :)