Handle replicates without libraries.
Make check-rendering script handle more errors.
Allow for antibody.host_organism being undefined.
Allow for replicate.library to be undefined.
Add option to check individual paths.
Revert stray changeset.
Handle missing replicate.library
Handle occasional server rendering process error.
Raise a non http exception so that the check-rendering command properly logs it.
Handle renderer subprocess errors. Every few thousand requests it seems to close the pipe unexpecterdly.
Merge pull request #80 from ENCODE-DCC/renderless-fixes

Renderless fixes