Fix unresolved function call on JVM < 1.7

This notably allows the mockwebserver project to be run on Android.
ServerSocket only implements Closeable since Java 1.7 and thus calling of
closeQuietly(Closeable) with a ServerSocket argument fails when running
on Java 1.5 or 1.6 JVMs. This is the same as is already done for
closeQuietly(Socket).
Added description and download info for MockWebServer.
Merge pull request #325 from square/jw/hide-missed-2.0-api

Hide a 2.0 API that was left public.
Merge pull request #327 from everett-toews/patch-1

Added description and download info for MockWebServer.
Merge pull request #322 from desseim/master

Fix unresolved function call on JVM < 1.7
Change HTTP date formats from UTC to GMT to conform to section 3.3 of HTTP spec document RFC2616 (http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3)

Addresses issue https://github.com/square/okhttp/issues/337
Fix up HttpResponseCacheTest.setIfModifiedSince test to work with GMT timezone format in if-modified-since header
Use 'jar-with-dependencies' version for jar download links.
Merge pull request #340 from square/jw/link

Use 'jar-with-dependencies' version for jar download links.
Merge pull request #339 from rupertbates/master

Change HTTP date formats from UTC to GMT to conform to section 3.3 of HT...
Allow PATCH to have body/output
Merge pull request #343 from JonWatson/master

PATCH body/output support
Fix a bug where authentication was incorrectly case sensitive.
Merge pull request #345 from square/jwilson/case_sensitive_auth

Fix a bug where authentication was incorrectly case sensitive.
Handle name/value header blocks with trailing bytes.

https://github.com/square/okhttp/issues/333
Merge pull request #346 from square/jwilson/trailing_bytes

Handle name/value header blocks with trailing bytes.
Remove useless String.format call.
Support use ';' as separator of "Cache-Control"
Merge pull request #347 from Ponyets/Cache-Control_separator

Support use ';' as separator of "Cache-Control"
backfill base test of simple http/2 headers frame