Load video thumbnail if mimetype is video.
Thumbor does centerCrop

By default, such issue was closed.
Added test for centerCrop behaviour.
Remove centerCropRequestsAreNotTransformed as centerCrop requests must be transformed.
Merge pull request #428 from eveliotc/thumbor-does-centerCrop

Thumbor does centerCrop
Document empty path throws. File equivalent call.
Merge pull request #429 from square/jw/doc-tweak

Document empty path throws. File equivalent call.
Merge pull request #413 from square/dimitris/video

Load video thumbnail if mimetype is video.
Update javadoc.
Merge pull request #431 from square/dimitris/javadoccc

Update javadoc.
java8.
Merge pull request #432 from square/dimitris/ps

java8.
Use new string builder for fetch() requests
Merge pull request #442 from jfsso/master

Use new string builder for fetch() requests
Enforce main thread for api calls.
Revert "Enforce main thread for api calls."

This reverts commit 2e5625dbd88d312b6a642120defaf9cf2e8ec313.
Enforce main thread for api calls.
Merge pull request #443 from square/dimitris/enforce

Enforce main thread for api calls.
Fix notifications for GB.
Merge pull request #452 from square/dimitris/notif-fix

Fix notifications for GB.
Final field.