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).
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
Merge pull request #355 from adriancole/http2-test

backfill base test of simple http/2 headers frame
update http/2 implementation to draft 6
Merge pull request #356 from adriancole/draft6-headers

Update to http/2 draft 6 CONTINUATION after HEADERS frame