Set up plugin manager for record drivers; made VuFind\Search\Solr\Results::getRecords work with search manager.

This revision temporarily breaks related record modules -- they will be fixed in the next commit.

Set up record loader to use Search Manager for class name determination; added alias to account for legacy VuFind source value in database.

Created plugin manager for ILS drivers; refactored \VuFind\ILS\Connection to use plugin manager and receive injected configuration; created temporary service locator workaround for \VuFind\Connection\Manager until the class can be completely factored out.

Introduced \VuFind\Search\Manager; began using it to replace \VuFind\Search\Options (refactoring still in progress).

Replaced singleton nature of VuFind\Cart with use of the ZF2 service manager; fixed bug with removing items from cart via AJAX.

Progress on upgrade process -- added config processing, added missing routes, fixed text in success template.

Eliminated router dependency in VuFind\ILS\Logic modules; created new view helper method to push router work into view; added related route definitions.

Eliminated "-tab" suffix from default record route names; this allows better backward-compatibility with existing templates, and it is also a more appropriate name -- the tabbed route shows the main record page, whether or not a specific tab is requested.

Set up record tab routing to avoid __call magic method; fixed some minor jquerymobile theme bugs along the way.

Implemented AlphaBrowse module; standardized related routes to separate legacy compatibility from current requirements.

Replaced ugly __call() methods with route configuration to achieve the same legacy compatibility effect.