Rename Request.Body to RequestBody and Response.Body to ResponseBody.

Compelling alternative is ReadableBody and WritableBody, or BodySource and BodySink.
Which in theory permits reuse for serverside body makers. But I don't like those names
as much.
Merge pull request #817 from square/jwilson_0510_drop_dots

Rename Request.Body to RequestBody and Response.Body to ResponseBody.
Rename Response.Callback to Callback.
Merge pull request #818 from square/jwilson_0510_callback

Rename Response.Callback to Callback.
Rename OkAuthenticator to Authenticator.
Merge pull request #819 from square/jwilson_0510_rename_authenticator

Rename OkAuthenticator to Authenticator.
Fixed typo in HTTP_2 JavaDoc.
Merge pull request #824 from ChristianBecker/patch-1

Fixed typo in HTTP_2 JavaDoc.
Don't rely on a fully-populated InetAddress for tests to pass.
Merge pull request #826 from square/jwilson_0513_requesting_site

Don't rely on a fully-populated InetAddress for tests to pass.
Add tests to show we drop authentication headers on redirect.

At the moment, we don't and the tests fail!
https://github.com/square/okhttp/issues/810
Rename redirectedBy to priorResponse.

I'm not completely in love with the name prior response, but it's better
than redirected by because it covers both redirects and authentication
challenges.
Documentation moved to GitHub wiki.
Update README.md
Merge pull request #833 from square/jwilson_0517_prior_response

Rename redirectedBy to priorResponse.
Merge pull request #832 from square/jwilson_0511_authenticate_and_redirect

Add tests to show we drop authentication headers on redirect.
First steps at making URLConnection a shim.

This extracts the URLConnection APIs to their own project. I still need to
go back and clean up some names in tests, add documentation, and move the
actual HttpURLConnection implementation details into this module.
Merge pull request #834 from square/jwilson_0517_urlconnection

First steps at making URLConnection a shim.
Move code to the urlconnection module.

We don't need this code for the core OkHttp API.
Merge pull request #835 from square/jwilson_0517_promote_code_to_urlconnection

Move code to the urlconnection module.