If OkHttp is present, require 1.6.0 or better.
Merge pull request #517 from square/jwilson_0527_okhttp_16

If OkHttp is present, require 1.6.0 or better.
Mention OkHttp 1.6+ in the change log.
[maven-release-plugin] prepare release picasso-parent-2.3.0
[maven-release-plugin] prepare for next development iteration
Update release date for 2.3.0
Fix deprecated constructors for Downloader.
Merge pull request #519 from square/dimitris/fix

Fix deprecated constructors for Downloader.
Update 2.3.1 CHANGELOG.
[maven-release-plugin] prepare release picasso-parent-2.3.1
[maven-release-plugin] prepare for next development iteration
Picasso.with() should be synchronized
Merge pull request #521 from Macarse/macarse/threadSafeSingleton_2

Picasso.with() should be synchronized
GB requires invalidateSelf().
Merge pull request #529 from square/dimitris/fix-gb

GB requires invalidateSelf().
Method name change (Exit -> Exif)
Merge pull request #532 from aldenml/master

Method name change (Exit -> Exif)
Return -1 as default value for missing or malformed content-length header.
Merge pull request #533 from square/dimitris/504

Return -1 as default value for missing or malformed content-length header
Update CHANGELOG for 2.3.2