first stab at repository-wide webhooks
add test to prove we registered a webhook succesfully
prove we're receiving webhook callbacks; serialize the body as Legacy JMS ATOM.
Merge pull request #37 from futures/webhooks

Webhooks
minor: clean up imports
minor: clean up imports
minor: removes unused get-checksum-as-a-string call
minor: cleans up dependency declarations. I'm pretty sure we're still pulling in too much in the way of transitive dependencies, however.
minor: more import cleanups
Corrects my overzealous dependency cleanup
Removes unused asChecksumString method
should be using org.junit.Assert.assertEquals, not junit.framework.Assert.assertEquals (latter is deprecated)
Removes unused code. Cleans up imports.
FixityInputStream wasn't being closed
move /objects initialization into the kernel
we need -http-commons as a compile dependency
remove duplicate dependency
Added delete to batch modify endpoint
Merge pull request #39 from vnguyen745/batch-delete

Added delete to batch modify endpoint
fix weird etag match failure under some environments