Added deposit bin collector, which gathers files from predefined directories and adds them to the ingest queue
Updated proquest normalization to work with batches of packages, so that it can deal with the output from bin collectors
Added locking to collect method to prevent simultaneous executions on the same key.  Added documentation to bin config.  Fixed typo on owner name constant, corrected name of DepositBinCollectorTest.  Logging when non-applicable file found in bin
Merge branch 'bagit-resque' into acquire-directory
Merge pull request #126 from UNC-Libraries/acquire-directory

Deposit bin collector