Added tag scaffolding so we can at least create/edit/remove existing
tags. Cannot yet add products to these tags from the tag controller, but
that should be easy to implement.
Made some modifications to the login / chooseLocation pages. Also made
error page more friendly. 
Improved the edit product page to make it a bit easier to use (includes
autosuggest for product name, manufacturer, unit of measure. 
* PIMS-1939 Product description should be viewable somewhere on the
stock card, not just in "edit product details" view
* Converted dashboard inventory search to globalSearch widget to enable
a user to search for existing products and shipments.
Added getRootCategory() method to Category domain.
* PIMS-1278 Allow user to import new products
* PIMS-1825 Allow user to import changes to existing products
* Refactored product export code (moved to service layer)
* Modified the megamenu
* Browse Inventory > Allow user to hover over product name to view
description (if it exists).