* Major code simplification of the importers.
Move towards using Model::fill and Model::update rather than reinventing
the wheel. This makes the updating/creating logic a lot clearer, and
allows for the deletion of a lot of code. Also allows for supporting of
more fields in the future really easily.
* Cleanup constructors and use setters instead.
* Set the LC_MONETARY locale, and use it to strip currency symbols in Helper::parseFloat()
* Move licenseseat creation/deletion logic into an event handler on the model rather than the controller.
* Move the logging of parsed values to array_smart_fetch rather than writing it out everywhere
* Move to storing dates as carbon rather than strings. Allows for the parsing of more arbitrary strings from the importer
* Add a license importer with support for checking out to users or assets.
* Make a directory for sample/mock import csvs and populate it
* Adjust how we store/retrieve dates to fix some issues the tests found.
