Moving component configuration into context.

Templates for manifest come from context.
Printers come from context.
More componentisation

Drop zone handling is now a component.
Reception component becomes a generic process choice.
New reception component that uses the above to get the old behavior.
Lab activities becomes a process choice with re-racking.
Whole load of configuration changes.
Refactored re-racking controller into a component.

Renamed user-barcode into barcode-scanner.
Use underscore.string for padding barcodes.
Moved all of the re-racking controller code & view into component.
Removed redundant deferreds from re-racking model.
Added a jQuery helper for functions that ignore events.
Force the load order of jQuery & bootstrap-collapse.

Bootstrap's collapse functionality requires jQuery to be available, but
requirejs doesn't guarantee the order of these, so sometimes errors
would appear in the console.  This shim fixes that issue.
Create a labelling component

Added success & info to the list of alerts.
Refactored label printing into labelling/printing.
Correct namespacing for printing events.
Moved barcode-scanner behaviour into labelling/scanning.
Support the ability to filter the printer list.
Error/status messages broadcast via events.
Move component styles into the appropriate places
Remove logger
Merge pull request #318 from mattdenner/more_component_reworking

More component reworking