Fixing directory and absolute_directory on BulkTask

BulkTask#refresh now sets the directory attribute to a relative path
from the configured bulk upload directory, and #absolute_path now only
prepends the base dir if the 'directory' path is relative.
Merge pull request #509 from OregonDigital/feature/bulk-task

Fixing directory and absolute_directory on BulkTask
Parallelize Travis tests.
Merge pull request #511 from OregonDigital/feature/ParallelBuilds

Parallelize Travis tests.
Return the correct result if not indexed.